The CMRA club I used to race in has one of the most competitive and quick formula 40 classes I have ever seen. One of my "old" teammates was 53 and could seriously kick SV ass and one of my chief rivals for the 02 championship was 48...I think I will have to have some severe back or neck problems before I hang it up.
Still it is funny when some LEO pulls me over and expects to chew up some kid and he sees the grey hairs under the helmet