Nice to see so many young aviators here!!
I had my first trial lesson when I was 9 and had 1 a month up until 15. Flew solo on my 16th Birthday then my grandad falling ill, 6th form, A-Levels and a car made me pretty much stop flying altogether. I took it back up earlier this year and passed my Skills test a couple of weeks ago whilst still 18 so i'm chuffed. It was a personal goal of mine to do it whilst still 18
I think it all falls down to personal circumstances, money...and weather. The exams I found straightforward (except for navigation which i thought was a b*tch!!) and took an evening class every week at London Met Uni which i thoroughly enjoyed and enabled me to get the exams out the way with relative ease. Good luck!