Check out this thread, it might give you a leg up on research and opinions.
https://bayarearidersforum.com/forums/showthread.php?t=547623&highlight=e-bike
We have three Specialized e-bikes; my wife has a Turbo Vado 5.0 SL, I have a Turbo Creo SL Comp Carbon Evo and a Turbo Levo SL Expert.
These are higher-end bikes (I'm not trying to sound aloof or snobbish here), all with the same mid-drive motor at the bottom bracket. The SL bikes have lighter motors and batteries with less power and weight than the non-SL versions.
I am in San Jose, and if you are ever down this way you are welcome to test ride any or all of them. We will start driving again soon to visit family in Lodi, and I would be willing to drive one to you to test if you like.
My wife is 68 with a replaced hip and arthritis in her spine. We both used to be avid on and off road riders until our son was born, who is now 30. She keeps saying how her e-bike is a game changer for her. It really is - for both of us -, as we ride a lot of off-road trails that she would not be able to do on a non e-bike. I would be able to do them, but would probably explode my heart doing so on some of them! 20 to 25 mile off-road rides are what we really enjoy. Her bike is not ideal for the trails we ride, but SHE LOVES HER BIKE! We ride a lot of the SC County and Santa Cruz parks, some of which have some decent elevation changes.
Drop me a PM if you would like to discuss riding these.
Good luck with your research, and let us know where you end up!