Obviously I can only speak from my own experiences (makes a change some might say) but I started at the college aged 26 with a young family. It was a big gamble and it has been a long hard slog.....count the grey hairs...BUT...there isn't any one of my friends who enjoy their job as much as I do. If ATC is for you, and it isn't everybody's cup of tea, then I really believe there is no better job in the world. The downside is the graft you have to put in to become valid. There will be many hurdles and obstacles on the way but stick at it. If you do get through the other side then I very much doubt you'll ever regret it.
Good Luck
V