18 and my first Android phone, though I had a Moto Cliq for a week but didn't mod it at all.
I also develop for the SK4G.
BTW, you have more 18-25's here, because most teenagers don't know who or what XDA is, let alone what ROM is, or what it means, or that you can root.
18-25 are usually the young PC technicians, hackers, and programmers.