You are not too old
You are not too old to start something new.
It has only been in the last 6 years that I have started running. It was not easy at first but as time went on has become easier and easier. I'm not fast and I don't jog far, but now I often find myself fancying a quick trot around the block.
And this year I have really enjoyed wild swimming. I always used to find swimming boring. Doing lengths in a pool was not attractive to me. I also have a fear of dry drowning (when I intake water however small I panic and don't breathe - silly I know). But just like the jogging over time things have become easier. Again, I'm not fast and I don't go far, but that said today I swam half a mile in the lake.
So, if you fancy trying something new - do it!! You never know where it might take you.