Nah,it's not weird.
Being more than 30 doesn't mean you can't play video games,and being a girl doesn't affect that either.
Our parents or grandparents still do things they did when they where young.
Perhaps they didn't had video games back then,but they had pinball machines and they could play things like cards,golf or soccer.
Lot's of those grown up people do these activities even today at their 50s and 60s and 70s.
We (that includes me and you) are people that grown up with video games,and it's normal to want to still do things we liked before.
What you did at your childhood will be something that you will always remember and want to do again.
To speak the truth,what seems to me rare,is that a female plays games like RPGs and is not restricted to cityville and wii sports.
I try to convince my sister to play 'serious' games,like RPGs or FPSs but she won't do even if I pay her.