I am 55 so a few years younger. I have basically started again from scratch after getting COVID earlier this year. Make sure you get an ok from the doc first. It will be a slow grind, do what you can at first, build slowly. Get at least 3 days a week, preferably more. After a few months it starts building, and you will feel more like a cyclist than just another guy on a bike. You have a lot of cycling years left.