I can totally relate. After not riding for decades I started up again in my mid forties. It was painful and awkward. But I persevered and eventually it got easier. When I was 50 I went on a bike tour through Vietnam. The steep hills were killers but I still loved it. Didn’t ride again for a couple of years and when I tried again it was like I was starting from scratch all over again. I have finally given up my cycling dreams. My aging body won the fight.