Hahaha!.. Talk about aging with the time eh?.. Alternate realm / dimension sex?
Well bro goodpartner, not really sure what's your age group but I think can say roughly around 30s lah.. Perhaps as you say age does play as a factor in your interest of sexuality. But I'll dare say that besides that factor, the amount of time that you have "cheonged" also plays a part..
How to put it? Take me for example: I'm 32 this year and I've been in the "scene" for the last 13 years, so technically it means I've started since 18.. (Wow.. Didn't realise this long until I typed it out..)
Anyway for my part, I've grown immune to GL/FL/WL or whatsoever nowadays too.. Last time I'm used to if whenever saw a SYT with SKIRT on (I'm a sucker for skirt dresses!!), my blood will rage and will want to explore further to see how pretty is that lass.. Now different already! If bypass any lady in GL, pretty lass or not, with dress or without dress ("Sure or not?.. Yeah, right..."), it seems not really able to arouse me anymore..
I deduce that for my case it's simply, probably, tired of cheonging, to look for lass, the energy to keep looking out.. I suppose I think that instead of me out there hunting, I'll rather them come to me on a silver platter instead..
But hey, that might still not be enough to get me interested 'cause... Now I've already got somebody else actually... Hehehe...
Cheers!