My Mom has never ridden a bike and more unusual never been swimming... shes in her late 60's, she had an horrific upbringing.
I have a friend who is early 50s, who has never ridden a bike nor ever been swimming, or even in a swimming pool for any other purpose like taking her kids when they were small etc.
Poor girl had a rather interesting Mum, when growing up but happily, not a horrific upbringing just not a very good one.
When I was a lot younger, I was shocked to meet a girl who had never been on roller-skates. They were the main form of transport, for us, growing up. Smaller to stash away than a bike for going to school etc. Now I know lots of people who have never skated, but when I was 18 or so, it was a very rare thing.