I struggle to have an opinion on this! I’m 100kg so am regularly overtaken by all kinds of cyclists, especially when going uphill, even more so if I’m on my fixed (when I’m usually at about 7-8mph). Haven’t seen any obviously illegal e-bikes here in SW London but I do notice when pensioners sail past me on their bikes (as an elderly lady did the other day on Kingston Hill). But surely that’s the point? Regardless of age, I choose to struggle, they choose not to. Fine by me.
As it happens a friend of mine in her early 60s who lives in Bath (ie steep hills in every direction) has asked me for advice on getting an e-bike - I plan to point her at a LBS cos I don’t know enough to help. My wife has also expressed an interest in getting one so she can come out with me occasionally - prob is there’s no room in the shed unless I get rid of one of my other bikes!!!