nearly 50, life long cyclist, been on strava since 2012 and had a PM since I was 43:
last week I did 30’ power PR and PR & top 20 on my local climb (admittedly I only moved here late 30s ). This improvement is down to WFH and more volume. I’ve said in other threads that for most of us our limiter is time not age. No doubt a slow down will come eventually but I don’t see it yet and I keep on working to put it off as long as possible!