33 for me too. I started cyclocross racing last year and now am doing cat 4 road. Now I am 34. My goal is to start placing in races soon. So far I always make the final field sprints but end up outside of the money but close. I met a guy who was 43 a few weeks ago doing his first cat 5 race. So at 29 you should be fine as long as your training is good your age within reason won't matter. You may be surprised at how fast your group is.