60 next month, bought an electric bike in the summer to do the 20 mile commute, and suitably enthused and fitter fitted narrow tyres to my normal mountain bike and was also using this a couple times a week until the dark/wet/cold stopped play. Average speed and distance have improved, and aiming to get a road bike next year. So perhaps electric bikes aren't so bad.
I am 44 and trying to stay in shape for my 50's which i am hoping will bring some financial freedom (kids grown up and self sufficient)
Its good to hear you can keep going into your 60's and beyond