Aging is the gradual decline in physiological function over time, increasing vulnerability to disease and death.

Longevity usually refers to lifespan (how long you live), but many discussions also include healthspan (how long you live in good health).

What’s the difference between lifespan and healthspan?

Lifespan is total years lived. Healthspan is years lived with good function and low disease burden.

Is aging mostly genetics or lifestyle?

Both matter. Genetic predisposition shapes risk, while lifestyle and environment modify how those risks are expressed across a lifetime.

Aging and Longevity Basics

Intro

This guide serves as a foundation for the Aging & Longevity topic hub. It explains the core ideas behind aging biology, lifespan, and healthspan, and links to deeper guides covering specific aspects of aging and preventive health.

Aging research focuses not only on how long people live, but also on how well they live during those years. Many modern discussions about longevity focus on extending healthspan—the years lived in good physical and cognitive health.

Understanding the basics of aging biology helps clarify which interventions are well supported by evidence and which claims remain speculative.

Core Topics in Aging and Longevity

Aging research covers many different biological systems and health risks that change over time. The Aging & Longevity hub connects several key areas of evidence-based health and prevention.

Major topics explored in this section include:

Skin aging and protection, including sunscreen, retinoids, vitamin C, and collagen support.
Cardiometabolic health, including blood pressure, cholesterol, and diabetes risk.
Brain health and cognitive aging, including dementia risk and neurological health.
Musculoskeletal aging, including bone density, muscle loss, and fall risk.
Lifestyle and preventive health, including nutrition, sleep, and physical activity.

These guides focus on explaining the science behind aging while highlighting strategies that help preserve long-term health and function.

Key Points

Aging is the gradual decline in physiological function over time.
Lifespan refers to how long someone lives.
Healthspan refers to how long someone lives in good health.
Genetics influences longevity, but lifestyle and environment strongly modify risk.
Many longevity strategies focus on reducing disease risk and preserving function.

Skin Aging and Longevity

Skin health is closely tied to aging biology, environmental exposure, and lifestyle. Ultraviolet radiation, collagen loss, and oxidative stress all contribute to visible and structural changes in the skin over time.

Several dermatology strategies have strong evidence for slowing skin aging and protecting long-term skin health.

Key guides in this area include: