How the Body Changes as We Age - TY HealthSpan

How the Body Changes as We Age

How the Body Changes as We Age
and How Exercise Helps

By Courtney Shields, Senior Fitness Specialist

	KEY CHANGES	REAL LIFE SCENARIO	WHAT THIS MEANS	HOW EXERCISE HELPS
Central Nervous System	↓ ~3–5% brain volume per decade after 40 ↓ 10–15% slower neural signals by age 80	Catching yourself when you trip Reacting while driving Stepping off curbs	Slower reflexes & coordination	↑ Improves reaction time ↑ Improves coordination & balance
Musculoskeletal	↓ 1–2% muscle loss per year after 50 ↓ 8–15% strength loss per decade	Carrying groceries Picking up children Getting off the floor	Loss of strength & independence	↑ Builds & maintains muscle and bone density
Cardiorespiratory	↓ 10% VO₂ max per decade after 30 ↓ 1 bpm max heart rate per year	Walking the dog Walking through the airport Going up stairs	Lower energy & endurance	↑ Boosts heart, lung & endurance capacity
Endocrine	↓ Insulin sensitivity with age ↓ Hormone shifts	Energy crashes Weight gain around the midsection Difficulty building muscle	Hormonal imbalance & energy fluctuations	↑ Improves insulin sensitivity & hormone regulation
Metabolic	↓ Gradual decline in metabolism	Weight gain despite same habits Lower daily energy	Slower calorie burn	↑ Maintains metabolism through lean muscle
Balance / Proprioception	↓ 30–40% decline in balance after 60	Walking on uneven ground Putting on pants/shoes Getting up at night	Higher fall risk & instability	↑ Improves balance, coordination & body awareness
Joint / Mobility	↓ Cartilage thickness & joint lubrication ↑ Stiffness with age	Reaching overhead Getting in/out of a car	Less mobility & more stiffness	↑ Improves flexibility, mobility & joint health
Immune	↓ Immune function with age ↑ Chronic inflammation	Getting sick more often Slower recovery	Weaker immune response	↑ Strengthens immunity & reduces inflammation
Cognitive	↓ Processing speed after 40–50 Memory changes	Forgetting names Losing train of thought Slower decision-making	Slower thinking & recall	↑ Supports brain health, memory & focus
Emotional	↑ Risk of loneliness & depression	Lower motivation Less social engagement Reduced confidence	Lower mood & independence	↑ Boosts mood, confidence & social connection

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