It's my 12s anniversary as a professional programmer. Did work on all kinds of projects: a hugely popular online game, a search engine, all kinds of smaller projects. Love programming more than ever.
Couple of noticeable age-related factors:
1. As a proud father I have to be very careful when planning my spare time. For example, I mostly do hobby projects early in the morning now.
2. Got my first serious RSI-related trauma recently. Younger programmers, please, start caring about your hands as early as possible!