James
This post came up a couple of days ago. I didn’t reply to him but did check details. CA shows him as 59 but ZwiftPower shows him as 60+ but he says he is not 60 until the coming November.
I know in some countries ( I think Europe?) and some sporting competitions that if you turn an age ( say 40 yrs old ) later in the year you can race/compete in that age category ( over 40s) anytime from 1st January of that year. [ Edit : not saying this has anything to do with how ZP is set up ]