One (secret) part of you is aging with exceptional grace.
When Japanese researchers looked at the blood of healthy volunteers ranging from 20 to 90 years old, they found that the rate of decline in certain disease-fighting and youth-preserving cells was slower in women than in men
. This led them to determine that women's immune systems stay younger for longer
. So, yes, you may have a few gray hairs or laugh lines, but your cells inside are smoking-hot.