Why is RW fixated on the idea that they're the only middle aged (or to everyone they speak to, 'old') walkers around, when it seems very obviously not the case?
I think it's to show how special they are. Not just did they do it, but they're so like <giggle> teenage lovers really.
At pretty much 80yo my parents do like a long walk - far more than I do, having been put off by their long treks when I was young. And until recently any suggestion that they might be even approaching middle-aged was seen as a bit of an insult. But now I've noticed a very slight change in attitude. "They thought we were just retired because they didn't expect anyone of our age to be doing this walk". They are just beginning to enjoy the thought that they are special to be doing certain things "at their age".
I suspect it's similar - although 30 years younger.
Although I remember when they were in their 50s, they stood on a park bench to look over a wall so they could watch a cricket match they hadn't got tickets for. An older lady came up and whacked the backs of their legs with her stick and told them "young hooligans, get down immediately".
Her face when they turned round and saw they weren't the teenagers she expected! They got straight back up when she'd gone, while me and my siblings, the actual teenagers, cringed as far away from them as we could reasonable go. 😂
They dined out on the "mistaken for teenagers" for a long time.