I get that you're trying to do an unselfish thing here, but I worry that it's going to harm your family more than you expect. Once your kids are 'raised' they're still going to want you to be around as a solid support, even in your 'unproductive' years. I'm 35 right now, and if my parents (~65) ever did this to me 'for my benefit' I'd be so mad at them.

You are important your entire life.