As for what kind you prefer, that's such an individual choicethat it's impossible to advise you. Fortunately, they aren'texpensive, so it doesn't cost much to shop around. I happen tolike the ones by G-Wiz:
Dan GardnerG-Wiz Design702-731-2093gwizdesign@aol.com
...but others like M. Stevens (lycra, very narrow thong), Capezio(several kinds, including one with a quilted front), Bal-Togs(they have a full-bottomed one, not recommended unless youabsolutely can't stand thongs), & others. People here willprobably recommend others, too. I'm afraid you're pretty much onyour own here.
P.S. Started at age 31; started again at age 62; now 70 & stillat it. You're never too old as long as your body doesn't give out.
Tom Parsons