These things are increasingly appearing over here too.
The 'Swytch' e-bike kit; basically a sensor (for pedal assist), hub motor/front wheel and battery pack is very popular.
I have seen them out on V-CC rides with a lot of interest in them amongst some of the older riders.
Whereas ten years ago some guys would have had to give up the practical enjoyment of their collections they can now still take part and enjoy the camaraderie of a group ride or the quiet pleasure of a solo jaunt.
As has been mentioned above you are very lucky if you can still cycle comfortably into your late 70's and beyond.
One guy I know is now adding such a kit to a third bike in his stable.
He's OK cycling on the flat but hills play havoc with his knees; it may come to all of us eventually.
From this point of view they are a very good thing.
Local bike shops tell me that they can't get enough stock of them to sell.
What does mess with my head is when I see people who I know are fit and well, or youngsters riding e-bikes; it just reflects the lazier lifestyles that many lead today I guess, but it is 'jarring' to me.
Although I will admit to using one some years ago in the Sierra Tramuntana region of Mallorca because my partner doesn't like pedalling uphill.
I was astonished by the efficiency and quietness of the 'Bosch' manufactured system fitted to the hire bikes, and the effortless way that the pedal assist aspect 'kicked in'.
Rules are different over here. Unless you are a very young child, cycling on 'sidewalks' is prohibited, excepting on special designated paths- I could face a £2,000 fine for doing so.
I cycle on the public roads 95% of the time.
We have national legislation already governing the power of e-bikes that limits what you can do.
It is also illegal to use a privately-owned electric scooter (the stand up style) except on your own land over here, but you can use them in certain cities that have 'scooter hire' schemes. These are the real menace in my eyes, and the cause of many accidents.
Police regularly confiscate the privately owned scooters and take great pleasure in cutting them in half with angle grinders then disposing of them.
But it's all inevitable I guess, in my local city of Oxford on this very day 28th. February, 2022 all petrol and diesel engines have been banned on certain city centre streets.
Many people won't be able to afford pure electric cars, so I guess that the e-bike will prove increasingly popular.