A fifth (20 per cent) of U.S. workers aren’t currently saving for retirement, according to a new survey by Flexjobs.

The survey, which polled more than 2,000 U.S workers, found nearly two-thirds (61 per cent) of men said they’ve been saving for retirement for a while, compared to 52 per cent of women. Across generations, baby boomers (61 per cent) were most likely to have saved for retirement, compared to roughly half of generation X (58 per cent) and millennials (46 per cent).

Read: U.S. employees feeling confident about retirement savings: survey

However, roughly a quarter (26 per cent) of millennials said they haven’t saved for retirement but plan to. Fewer than a fifth of gen-Xers (17 per cent) and baby boomers (11 per cent) agreed with that statement.

Meanwhile, more than three-quarters (77 per cent) of respondents agreed people should be allowed to retire and access their Social Security benefits before age 67.

Read: Digital engagement helping plan members save more for retirement: report