How the Body Changes From Birth to Old Age

  1. Oxygen Shift: Newborns switch instantly from placental oxygen to lung breathing at birth.
  2. Bone Boom: Babies have 270 bonesβ€”many fuse into 206 by adulthood.
  3. Immune Build: Childhood introduces thousands of new microbes that train the immune system.
  4. Muscle Peak: Strength typically peaks in your late twenties before gradual decline.
  5. Vision Clarity: Eyes mature through childhood, achieving full focus around age six.
  6. Metabolism Map: Your metabolism peaks in childhood, slows in adulthood, and drops sharply after 60.
  7. Heart Story: The heart thickens slightly with age, pumping less efficiently over time.
  8. Skin Shift: Collagen decline begins as early as the mid-20s, softening elasticity.
  9. Brain Curve: Cognitive processing speed peaks in early adulthood, while wisdom grows with age.
  10. Aging Arc: Older bodies repair slower, but lifestyle can greatly shape how aging unfolds.