Don't stop doing something you enjoy, thinking there's time to pick it up again later. I played badminton a lot in my teens and loved it. Then I went to uni and didn't continue with it, moved around the world, and every move would casually think "wonder if there's a badminton club around". Now I've finally started playing again and the first thing I did was get an injury because I tried to play like a thin, fit 18 year old in the body of an overweight 39 year old. But I still love it and can't help regret 20 years of being too lazy to just look up a club and go.
This hits home. I started playing badminton when I was about 13 at a tiny club in a rural area. I ended up playing against adults most of the time. By the time I was 16 I was completing in the adult League with my club (instead of playing in my age category). I played for a while in uni too, but eventually quit because I moved to an area that didn't have a club. Always thought I'd resume paying. I'm 47 next year, so I've left it almost 30 years.
I regularly run an cycle, and kept my weight/waist the same as my 18 year old self, so that's it: tomorrow I'm going to find a club and join.