never too old , Im 34 and have just bought a kart again , I did race about 8 years ago though.
I dont know too much about the rules and stuff in your part of the world , but get to your local kart track on a club day and start asking questions to the competitors and club president and stuff like that.
you may (and probably will) make some bad decisions in getting started but you will learn quickly as to what you should be doing.
I cant help much but if you decide to give it a go , enjoy it mate its great fun
