A paediatrician is a great job. Although, you need to like working with children a lot. I think it can be a very difficult job too though when you have to deal with very sick children. I’ve checked with one of the clinicians (medical doctors) in my office and yes they deal with children up to 16.
If you’re interested, maybe try asking at your local hospital if you could talk to a paediatrician about what it’s like or ask your careers adviser if they can sort this out for you.