What a depressing thought. :-(
I don't Strava or keep track of my speed, so I am probably getting slower every year and am blissfully unaware of it (which is the way I like it). I'm not so interested in being fast ... so long as there is someone else as slow as me to ride with. For me, the whole point is tooling around on the bike, enjoying the scenery and the company.
I plan to be riding well into my 70s and hopefully into my 80s, if I live that long. I'll do what it takes to get there, and I'll succeed or know the reason why I can't.
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Proud parent of a happy inner child ...