Muscle and mobility
Strength is part of carrying groceries, climbing stairs and maintaining independence. Physical activity and function belong in a healthspan discussion alongside body composition.
NIA: physical activity and healthWhat do you want
your years to hold?
Living longer is only part of the question. Explore Dr. Hogan’s perspective on healthspan: the health, function and independence that help you take part in the life you value.
Explore the researchEducational information · Independent research
What do you want your years to hold?
Longevity discussions often focus on the number of years lived. Healthspan asks a different question: how much of that time is spent in good health?
- Lifespan
- The length of a person’s life.
- Healthspan
- The part of life spent in good health, rather than simply the total number of years.
- Your priorities
- Walking with family. Staying engaged in work. Keeping up with the activities you enjoy. These make a health conversation personal.
A longer life and a healthier life are related goals, but a study measuring one does not automatically establish the other.
Mayo Clinic: understanding healthspanAging has many moving parts.
Researchers study changes in DNA, cellular energy, inflammation, and other biological processes to understand aging. A 2023 review describes 12 interconnected “hallmarks” that organize this research.
This is a framework for asking scientific questions. It does not establish that a product targeting one process will extend a person’s life.
Read the 2023 review in CellExplore the biology in plain language.
Open a theme to see how researchers organize the questions.
DNA and its instructions
DNA damage, shortening chromosome ends, and changes in how genes are regulated are among the processes researchers study.
Energy and maintenance
Scientists investigate mitochondrial changes, nutrient sensing, protein quality control, and the cell’s recycling systems.
Cells and their surroundings
Senescent cells, reduced stem-cell function, altered cell communication, chronic inflammation, and changes in microbial communities complete the 2023 framework.
An editorial grouping of the 12 hallmarks, not a diagnostic checklist. These processes interact.
Source: aging hallmarks review, 2023A mechanism is a starting point.
What happens in a cell or an animal cannot, on its own, tell you whether a treatment is safe or effective for you. Human studies, meaningful outcomes, and individual medical context matter.
Look at what a study actually measured.
LIFE randomized 1,635 sedentary adults ages 70–89 with physical limitations who could initially walk 400 meters. It compared physical activity with health education over an average of 2.6 years.
Loss of the ability to walk 400 meters
- Physical activity group
- 30.1%
- Health education group
- 35.5%
Lower was better. This supports a mobility benefit in the studied population, not longer life or the effectiveness of SuccessRx medications.
Serious adverse events were reported in 49.4% and 45.7% of the respective groups; the difference was not statistically significant.
Read the LIFE trial in JAMA (2014)Your health is more than one number.
Dr. Hogan’s starting point is the life you want your years to hold. Travel, meaningful work, relationships and everyday independence can help you identify the questions that matter to you.
Measurements become useful when they can inform a decision. Health history, symptoms, medicines, physical measures and appropriate testing provide different pieces of that picture. An interesting biomarker is not automatically an actionable one.
Ask what the result would change.
Would a test change your care, help monitor an established risk, or mainly provide information whose clinical meaning is still uncertain? No single hormone value, NAD+ level or biological-age score defines how well you are aging.
Testing availability, suitability and follow-up depend on the clinical service and your circumstances. This guide does not promise a specific testing program.
Capability, recovery and connection belong together.
Metabolic health
Blood pressure, lipids, glucose regulation and medical history answer different questions about risk. Discuss which established measures are relevant to you rather than pursuing a universal “optimal” number.
Hormones in context
Higher is not automatically better. Symptoms, age, medicines, medical history and the method used to measure a hormone all matter when a clinician interprets a result. Treatment and monitoring must be individualized.
Sleep and recovery
Sleep quality, duration and regularity deserve attention. Persistent difficulties or possible sleep-disordered breathing are reasons to seek an appropriate clinical assessment.
NIA: sleep and older adultsRelationships and purpose
Health also exists in the people and activities that give life meaning. Research links loneliness and social isolation with health risks; association alone does not prove a specific intervention prevents disease.
NIA: staying connectedCellular energy
Mitochondria and metabolic signaling help explain how cells function. Their role in aging research does not establish that changing a cellular marker improves a person’s health.
Cell: the hallmarks frameworkBrain health: a whole routine, tested together.
The 2025 U.S. POINTER trial enrolled 2,111 adults ages 60–79 at increased risk of cognitive decline. Over two years, it compared structured and self-guided programs combining exercise, diet, cognitive and social activity, and cardiovascular health monitoring.
Both groups improved on cognitive testing.
The structured group improved more: a difference of 0.029 standard deviations per year in the overall cognitive score (95% confidence interval, 0.008–0.050).
That is a small difference on a standardized test scale, not a percentage improvement in memory. Whether it translates into lasting everyday benefits needs further study.
What this result cannot tell us
There was no untreated control group, and repeating tests can improve scores. The trial was not powered to establish prevention of dementia. Because the program combined several activities, it cannot identify one ingredient as the cause of the difference.
A biological-age score is an estimate.
Some research tools use chemical patterns on DNA to estimate biological age or the pace of aging. Different tools measure different patterns, so they can give different answers.
CALERIE: one trial, different clock results.
A 2023 analysis examined DNA methylation in blood samples from CALERIE, a two-year trial that randomized 220 adults without obesity to calorie restriction or their usual diet.
- DunedinPACEA small slowing in the estimated pace of aging.
- PhenoAge and GrimAgeNo significant treatment effect on the biological-age estimates.
These were molecular measurements. The analysis did not establish that participants lived longer or developed fewer age-related diseases. Long-term clinical benefit remained unknown.
Waziry and colleagues · Nature Aging · 2023A study description is not a diet recommendation. Discuss nutritional needs and any proposed dietary restriction with a qualified clinician.
NAD research: follow the formulation.
NAD+ participates in cellular metabolism. Interest in this biology has led to studies of compounds the body can use to make NAD+, including nicotinamide riboside, or NR.
In a small 2018 placebo-controlled crossover trial, 24 healthy adults ages 55–79 completed six weeks each of oral NR and placebo. NR increased NAD+ in blood cells. The study was a short, exploratory trial, not a test of human lifespan extension.
Oral NR is not injected NAD+.
The molecule, route, dose, study population, and outcome all matter. This trial cannot establish the benefits or safety of NAD+ injections, or of a SuccessRx product.
Read past the headline.
Try these three research headlines. Open each to see the next question worth asking. They are illustrative examples, not claims about a treatment.
“A molecule changed a cellular pathway.”
Ask: Was this in cells, animals, or people? A biological explanation can justify further study without showing a benefit for patients.
“People with this habit had better health.”
Ask: Was the habit assigned randomly or simply observed? Differences in income, baseline health, or other habits can influence an association.
“A randomized trial found a benefit.”
Ask: How large was the difference, who participated, what were the harms, and how long did it last? A randomized trial answers a particular question, not every question about an intervention.
Keep the denominator in view.
In the LIFE trial above, 35.5% minus 30.1% is 5.4 percentage points: about five fewer participants out of 100 developed the measured mobility limitation. That arithmetic describes this trial’s observed proportions; it is not a prediction of your personal benefit.
The foundations still deserve your attention.
The National Institute on Aging highlights physical activity, nutritious food, sleep, preventive care, and social connection as parts of healthy aging. These belong in the conversation alongside any interest in treatment.
- MovementDiscuss activity that fits your ability, health, and daily life.
- Food and restBring questions about eating patterns and sleep to your care team.
- Connection and careMake room for relationships and regular health check-ins.
Start with your circumstances.
Two people of the same age can have different histories, goals, medicines and risks. Dr. Hogan’s framework brings those differences into focus:
- Understand. Describe your history, symptoms and priorities.
- Measure thoughtfully. Ask which clinical information would change a decision.
- Evaluate options. Consider evidence, risks, alternatives and suitability.
- Monitor. Understand the follow-up appropriate to any prescribed treatment.
- Reassess. Review changes in health and new evidence with your care team.
This is an educational framework, not a guarantee of particular tests or a live appointment at every step. An additional medication requires a new intake and purchase process.
Follow the evidence back to its source.
Selected research and clinical education, checked September 19, 2026. This is an introductory reading list, not a systematic review. Publication dates are shown so older findings are not presented as new discoveries.
- Mayo Clinic: lifespan and healthspanClinical education · Definitions and perspective
- López-Otín et al., Cell (2023)Review · Framework for the biology of aging
- Pahor et al., JAMA (2014)Randomized trial · Physical activity and mobility
- Baker et al., JAMA (2025)Randomized trial · U.S. POINTER cognitive outcomes
- Waziry et al., Nature Aging (2023)Post hoc trial analysis · DNA methylation measures
- Martens et al., Nature Communications (2018)Small crossover trial · Oral NR and blood-cell NAD+
- National Institute on Aging: healthy-aging guidePublic health education · Everyday foundations
Bring better questions to your next conversation.
- Was this studied in people with a health history like mine?
- Did it change how people felt or functioned, or only a lab measurement?
- What are the risks, alternatives, and unanswered questions?
- What follow-up would be needed, and how would we judge whether it helps?
Educational information is a starting point for discussion, not personal medical advice. These sources are independent research and guidance, not SuccessRx clinical trials or evidence that our treatments slow or reverse aging.
Explore my next stepSample intake only. No patient information is collected. A prescription requires an individual clinical review and is not guaranteed.