I live in London with my wife and we have four cats which are 11 or 12. The most cats we have had is 7 at any one time but we have have fed up to five other cats even then.
My wife and myself don't plan to have any more cats when the remaining cats pass away, but you never know. I am 60 and my wife is 52. We have had to put one cat to sleep this year and one cat to sleep last year. We also worry about what would happen to cats if we died before them.
The four cats we have now are all healthy so we are looking forward to many years yet.