Last year, 16 July 2000. Was 27 years old, went solo on 28.05 hours. For what it's worth I only fly once, sometimes twice a month, and my tuppence' worth is that it's nowt to do with age, it's to do with how often you fly and with whom.
I've now got 4 hours solo and am about to start nav training, with a view to finishing the whole shebang sometime next Spring. Hopefully ATPL theory after that.