Interesting

Having played tennis in the same court 4 times a week I have found some really interesting things. I realiezed there is very few people between age of 20-40 that frequentyly play tennis. There is lots of senoirs there which is pretty good at tennis, and us juniors that play tennis alot there. As I was discussing with my friend there he told me that it was due to the fact that 60 years ago tennis was extremely popular. Now from all these things I saw, I wonder what would happen in 20 years when the people who is now seniors pass away and people 20-40 replace them. Would tennis slowly lose populairty?