I was at the local LBS today. Probably 50/50 between pedal and e-bikes on the sales floor . I have a MUP across the street from my house. I would agree I see more younger e-bike users than senior, but my observation is that most of the younger e-bikes users are using them for transportation as opposed to the older cyclists who are riding pedal or e-bikes for fitness. I also RV, At the RV resorts and rallies,you will see way more seniors on e-bikes than pedal bikes.
I’m just getting back into cycling again after a few years of medical issues with my legs. when I stopped riding my pedal bikes, e-bikes didn’t appeal to me since I like like long rides and touring so instead I bought a 700cc Honda motorcycle. Once I age out of the motorcycle and if the leg issues come back , I will probably try an e-bike.