Join Date: Mar 2014
Location: Alpenrose - Portland
Bikes: Veloforma for my primary.
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your question is too simple. I assume you are in the US, if so that makes it slightly easier. In general it is in 5 year age increments based on your age on Dec 31 and starting at 35-39, then 40-44, etc.
However that is only the generic answer for something like nationals. For any other race it can be any other combination 35+, 40+ and 50+ are all common, but I have seem many others as well, promoters choice to get the largest number of people to show up. They will also sometimes limit it by race category in addition to age. Last weekend I was at a race and it was something like 35+ Master 4/5, then 35+ Master 3/4, 50+ Master 3/4 and 35+ Master 1/2/3.