What people tend to forget about infants and small children is that they are constantly exercising, eating a ton of calories, and then getting tons of sleep.
Adults, by contrast, tend to be very sedentary with slower metabolism and a ton of anxiety from stimulants/stress that prevent long, regular rest cycles.
Also, incidentally, if you really want to fuck up a child early in life… Malnutrition, immobility, anxiety, irregular sleep cycles, and lots of stimulants (particularly cigarettes) will have your teenagers looking geriatric.
What people tend to forget about infants and small children is that they are constantly exercising, eating a ton of calories, and then getting tons of sleep.
Adults, by contrast, tend to be very sedentary with slower metabolism and a ton of anxiety from stimulants/stress that prevent long, regular rest cycles.
Also, incidentally, if you really want to fuck up a child early in life… Malnutrition, immobility, anxiety, irregular sleep cycles, and lots of stimulants (particularly cigarettes) will have your teenagers looking geriatric.
The primary difference isn’t the exercise but the level of human growth hormone, which starts to drop after age 30
Unless you’re in the early-'00s MLB.