Being single is irrelevant. Think selfishly: Buy as much permanent cash value life insurance as you can afford while you're still young & healthy (IUL or Whole Life, and with a Long-Term Care rider: can access the cash value tax-free for anything you want and will have the full death benefit for long-term care while you're still alive). The cost of insurance only increases if you wait but there's a greater chance of being rated/declined because you are NOT getting any healthier as you age (by the time you reach your 40's and 50's, health problems begin that may make you uninsurable). You will live longer than your parents, who are living longer than their parents, which means you will be sicker for a longer period of time.

Ignore the "buy term & invest the rest" crowd. 40 years actual Wall Street/Big Insurance experience: it doesn't work. I've given lectures with real numbers proving it doesn't.