When should I get new cats?

I guess I sort of already know the answer to this one. When I’m ready. Here’s the deal. One night, almost 21 years ago I adopted two kittens: Bugsy who was about 8 weeks and Casper who was about 11 weeks. Bugsy died about three years ago at 18 and Casper died about 2 months ago at almost 21. I’m a little biased, I know, but they were about the greatest cats a person could ever want. Smart, funny, sweet, playful, mischievous, affectionate to a fault and loyal and forgiving. I miss them a lot and they can never be replaced, but this is the first time in over twenty years, and one of the few times in my life that I have been without companion animals. I figure either I will find the right cats or the right cats will find me. But I really miss having animals, particularly cats around. On the other hand, I am free of the worry and bother of having to board my animals while I travel for a few days or even longer. Anyone have any experience losing a beloved pet and dealing with getting another or others? How did you know when it was the right time? How did you found the right animal(s)?