^^
You can also set up a daily budget so that your costs don't run out of control and you get to choose whether you want to pay per click (CPC) or per impression (CPM).
Send me a PM if you want to run your copy by somebody (who also happens to be in your targeted age group).
http://forum.calgarypuck.com/showthread.php?t=91113
Two drawbacks:
1) Even though you can get specific, you're still going to be targeting all of Calgary.
2) Not much space - you're not making a rich magazine ad, just a small button on a Facebook page. So basically you're looking at name recognition and bringing traffic to your website (where you have more control and can build a deeper connection)