With age, bones tend to shrink in size and density, weakening them and making them more susceptible to fracture. You might even get a little shorter. Muscles generally lose strength, endurance, and flexibility, factors that can affect coordination, stability, and balance. Teens going through puberty will experience many changes in their developing bodies as their muscles change shape and increase their growth.
Although men tend to stop accumulating body fat around age 55, weight gain tends to continue in women until age 65, mainly because metabolism slows down with age, making it difficult to maintain or lose weight after age 60. While these protein levels tend to remain relatively constant, the researchers found that large changes occurred in the readings of multiple proteins around adulthood (3 years), late middle age (60 years) and old age (7 years). Interestingly, when the system failed to predict an age that was too young, the subject was usually very healthy for his age.
