I'm not really into celebrating my birthday? How about you?

Growing up, my birthday was celebrated with cake and presents, but that was basically it. I still like to keep my birthday pretty low key, but I get signals from friends and coworkers that this is strange. If my birthday is on a weekday, I usually wait until the weekend to celebrate and then I celebrate by going to an expensive restaurant and ordering whatever I want (no diet, no budget). People are fairly disappointed with this answer. I guess I would prefer to do something because I want to and when I want to rather than have the timing be dictated by the day I was born. Am I weird? Old fashioned? Spot on?