No matter how much money you have the facts don't change; we aren't even close to significantly improving lifespan is healthy humans. At most there are a few tricks like engaging in sauna 5+ times a week or taking metformin that might give you a boost if you're not already in top physical shape. There's a lot of money to be made heavily suggesting we may be able to 'soon'.
If you're gonna grift rich fólk, may as well do it to billionaires.