In NZ I ride with a veterans cycle club. So I get to see people aged 60, 70, 80 and 90 plus enjoying cycling, on normal bikes. The 90 year old doesn't cycle hills, he simply does a 25km circuit on the flat around the club house and people who want to can join him. He enjoys being out and about and ctaching up with everyone.

In Singpore e-bikes are a big thing, being imported down from China. They can go pretty fast, 40km+. It was annoying when one passed our tandem when we were doing 35km/hr.

E-bikes have some problems-
They are silent- so you cannot hear them coming. And of course quite a few e-bike riders ride them on footpaths as they are afraid of the roads. Accidents happen and these things are heavy and fast.
E-bike riders often ignore rules- they don't consider themselves car or motorbikes so ride everywhere and don't even wear cycle helmets.
E-bikes often put power in the hands of someone unable to handle it- just like motorised scooters for the elderly, sometimes having power in the hands of someone unable to control it being either too young or frail of health also can cause accidents.

I once worked for a company that tried to sell e-bikes to postal workers. At that time the batteries were not reliable and without power the bike became difficult to ride. It seems that the posties liked having simple mechanical bikes as they knew how to fix them and it wasn't a disaster then the battery failed.