Women are less confident about retirement than men, save less for retirement, and often say they don't know what to do to improve retirement planning — but give them the right advice and their behaviors change.

That's according to a survey conducted by TIAA-CREF, which found that women's confidence concerning retirement increases substantially, and their behavior changes, when they've gotten financial advice.

While only 56 percent of women (compared with 63 percent of men) feel confident that they've saved enough for retirement, 63 percent of women who've gotten financial advice voice confidence on the matter. Among women who haven't received advice, only 45 percent say they're confident.