I am 62 and have written software for fun and profit since 1977. But there are not many.

You need to keep in mind that home computers and the internet are a late 90's thing, so that is probably the explanation right there.

People in their 40s now are the first generation to have computers.

In 1977, I had to program on a mainframe using a teletype terminal. I did not have my own computer until 1979, and I was the only person in school who had one—including the teachers!