Caffeine can contribute to bone brittleness, and bone loss (reduces calcium), so it could be bad for a young person going through puberty. The way to prevent this is to drink more milk and dairy products.
no. my son is 6 ft. 7 in. and started drinking coffee around 8 on a regular basis. i don't think it stunted his growth. and no that is not a typo, his father is 6 ft. 4 in. and i am 5 ft. 8 in. and i have been drinking coffee since about 6 yrs. old. my daughter is 5ft 9, and my other son is 6 ft 4. genetics, not coffee