The Conversation – Jennifer L. Temple
When my daughter was around 14 years old, she began to ask if she could have a cup of coffee in the morning like Mom and Dad. As a scientist who studies the effects of caffeine – the ingredient in coffee that helps wake you up – on kids, I had more information available to me to inform my answer than most parents would. Many kids and teens consume caffeine. The main source of this chemical is soda for children under 12. Even colas have lower levels of caffeine than tea or coffee.
https://theconversation.com/is-it-ok-for-teens-to-drink-coffee-129133