Started racing at 43. I didn't think it would be easy to beat but knee surgery at 50 made my pr's impossible to match. But still thankfully even with surgery at 50 I bounced back to some (relatively) good times. I am late 50's and still feel pride and competitive in my performances.
You probably started racing rather late? If you pr after your best period of training, probably most might think they can still improve. It's never obvious when you're at your peak.