Question: how much caffeine for 17 year old?
Answer: Burrell advises that adolescents under 14 should avoid caffeine where possible, and teenagers between 14 and 17 years of age should limit their intake to 100mg or less a day. “That's equivalent to a small milky coffee (60mg), or a couple of cups of tea (30mg each), or some [dark] chocolate (26mg/40g) a day,” she says.