Proof if you look over 19 and you can dress mature and all you can probably get in the afterhours in toronto. There's Boa, Film, and Comfort Zone and I don't think they will id you. They're all in china town downtown and I guess its a different kind of place to be if you've never been to anyone of them.
I wouldn't recommend comfort zone unless you're really hardcore, people die there on a yearly basis, and they even have a emergency room for people who OD, which happens pretty much every weekend. So unless you're literally "dieing to party" then thats the place to go. Mind you I find the place kinda interesting, not to mention some of the best canadian underground dj's play there, and I really think they play the best house music there. THe downside is of course its packed with wierdo's and just downright scary. Here's a club report about it. Its pretty fucking funny.
http://www.cs.mcgill.ca/~rrause/clubs/zone.html
You could always get a fake id or pay the bouncers off. It works all the time except places like the guv, and the up scale nightclubs.