Well, here you are, retired,"" gushes this folksy tittle tome. Full of youthful zest in spite of your 72 years. All kinds of doors are open to you: you might become a cat sitter, or a baby sitter, or a dog sitter in the country, or a dog sitter in the city (one full chapter is given to each of these sterling alternatives). Dog-care booklets, says Ray, are available free from dog food dealers! If you hate animals and children, you might try delivering tomatoes fresh from the farm to a selected neighborhood clientele. Or, you can pick up some nifty crafts tips in the Ladies' Home Journal, modify them to make them your own (of course), then sell them. There must be more to this growing-old business.