To give you an idea I was rung today for the second stage in HK.
I'm 20;
Got C's for Maths, Physics, Chemistry and Japanese and an A for web design at school in 2006 (completed Yr12);
Worked for 5 years so far;
Only 5 hours dual flight experience for a rec licence;
Have my SPL and ASIC;
Doing an aviation degree at uni currently, only half a year through so far;
And am not 'fit' as such but not terribly overweight either.
Hope that gives you some direction.