Geeky? Definitely, but I wouldn't say I'm particularly old, as in
John Lennon died more than 10 years before I was born and
Yoko Ono is my prevailing association with
Yoko.
I don't think
Yoko really works if you aren't Japanese, it doesn't cross-over well and it has one major association for most people (I don't see the Beatles going away anytime soon). I think I remember being told
Yoko is fairly dated in Japan.