YOU KNOW YOUR GETTING OLD WHEN....You pass a school and it isn't just the Schoolchildren who start looking young.

When you first start school everything seems so scary and everyone and everything seems much bigger than you, and that's just if your the class goldfish.
The fields are like mammoth jungles, the playyard a vast concrete landscape the size of new york, bigger kids who are fifty feet high and teachers who are hundreds of years old. Walk past your old school now and if it hasn't been closed down then it will all look so small. The fields that were once jungles or now less scary than the streets that surround them, the urban concrete jungle of the playground, is like a small yard you could just about park your car on and soon will do when the school becomes another bunch of houses.
As for the fifty feet children, well the older you get you start to learn they aren't fifty foot, except for that kid whose always on stilits, and the teachers aren't hundreds years old, well your not so sure about the odd one who seems to have teached geenrations of your family.
That all comes with age though, you accept these things, in fact by the time you leave school you realise the place is full of annoying little kids who you were never like and your too adult enough to be near them, in fact you look down them, especially after you've pushed them over. However that isn't a huge sign of getting old, that's just a sign of thinking your old enough.
No the real sign that your getting old is when you start to fancy the teachers, not in i'm a fourteen year old whose giggly everytime the fit english teacher speaks to me and that's just the boys. No the real sign your getting old is when you pull someone in a club and they tell you their a teacher, when you have friends who are teachers or worse still your partner is a teacher. This is a real sign of being old, or having really good fake id.
And when the teacher's start looking a bit young to you, you know your in trouble, not least if your repeating year ten again.