I was late for both. I took no interest in riding a bike until my parents decided to sell it at a garage sale. Someone suggested they were interested and I hopped on and rode up the street like there was no tomorrow. So, that was the end of that. I think I was 6 or 7.
Swimming I was about the same age, my grandparents were visiting us and I was swimming in their hotel pool, finally got the hang of treading water and doggy paddle.