Re: Could you live aboard a 25 ft sailboat?
You must remember the shape of a boat. The only 22ft boat you will have 22ft of usable area in is a houseboat, and even then you lost 2-3' length for walk-around decking.
Based on an average 22' sailboat, you have 3-4' of cockpit, leaving the rest for livable area, which means 18-19', less the very bow (2-3'), which is too small for anything but small item storage. That leaves about 16' of technically usable are for living quarters. From that, you need a galley (3-4' minimum), head/shower (2-3' min), bed (convertible to a dining/livingroom area) (7' min). That leaves about 2-3' of storage for everything you need to live on, including clothing, waste, water, food, fuel and power. This assumes you sleep with the #2 person you live with and the #3 person is an infant which can sleep in the galley. I think the 3 person livable area on a 22' sailboat is purely theoretical and not actually possible.
Personally, I don't see a 22' sailboat as being usable for anything beyond a day cruiser and maybe a 1-2 man weekender. If you go beyond that, you are fighting space you don't have.
As for anything beyond a 22', I can't comment as I've never been aboard anything larger.