My parents are in their 70s and my dad is a volunteer for help the aged, he goes to visit an "old boy" a few times a week to have a chat, take him shopping etc. My parents go to shows, go cycling, go walking all over the place...They are fit and healthy and would be quite offended to be referred to as elderly!
My dp is 57 in a few weeks and is still a lifeguard, still young at heart and most definitely not old!
And 35 is not middle aged.
How old are you op? 12?
It's the school holidays isn't it?