They are Real, I Married one -- One Who can kick my ass from here till next week in DOA2 on my Dreamcast. Hell, you should See my 5 year old Girl Play Mario Cart
i have yet to meet a girl in real life who plays videogames (solitaire and bejewelled do not count). therefore these mythical gamer girls are no more real than 'unicorns' or 'egyptians'.
As for age,
Im a compu-geezer at 34 years old..
My first Modem was 300 Baud and could be connected to one of three local BBSses. I still have The Vic-20 it connected to in good working order... Actually, I think I still have the modem too..
Damn, I just realized my first home Computer is now 21 years old -- Its old enough to go out and get Drunk--.. now I do feel old..