You are never too old! I did a load of racing when I was younger (Juvenile and junior as it used to be called) then a load of TT into my mid 20’s. Had an enforced few years off because of a young family but have started up competing again recently. Have had a bash at track cycling over the last 18 months and done a few track league races. Will do a few crits, TTs, cx and mtb events this year (I am now 41).
Now I am older I just turn up and enjoy myself, I don’t beat myself up if I don’t do as well as I want to. I just enjoy the whole day out. The drive to the event, signing on, getting ready, a bit of a chat with fellow riders, suffering and then reflection of the day.
Don’t get too wrapped up with the event you are doing. Treat at ‘dipping your toes in the water’. Don’t expect too much and you won’t be disapointed. You can assess where you are and where you want to go after you have ridden your first event.
Good luck and come back and tell us how you got on.