I didn't wait until 80. I wasn't able to ride the hills and distances I could 10 years ago now that I'm 77 years old. I bought a Pinarello Dyodo that has the ebikemotion x35 motor which is 250 watts. It was 2019 NOS. It will assist up to 20mph. It has 3 assist levels. I mostly ride with no assist or 1st level on mostly flat terrain but I've gone up some steep hills (15%) in the 3rd assist level sitting down. On a 46 mile ride last Wednesday with nearly 2000 ft of elevation I still had 45% of battery left. I'm very happy with the purchase. It was just time to get some help on some of the routes I've been avoiding that I enjoyed in the past but didn't feel I could do them any more without over doing it.