As someone who has already gone through this let me make a couple of suggestions.

Unless you like sailing and racing alone, you are going to miss your crew and your 19.

Except for the A-Class and some special boats, single hand cats are big and heavy to rig, launch, and right by yourself.

I would suggest looking for racing crew. Look for someone young who fits in well with you and your wife. This is hard work and you will probably go through several prospects before you find someone you can work with. But you get to keep sailing like you want and you bring someone young into the sport.