[thefringthing]

If Denmark wanted to fund the same number of retired years per person as the US did when Social Security was established, the retirement age would be about 68, based on the 1935 and 2025 actuarial life tables for the USA and Denmark respectively.

[jeanlucas]

But you also need to account for the changing ratio of contributors to beneficiaries, how many workers are supporting each retiree.

What would the age be to keep the same "ratio"?