Here that's now a compulsory thing - superannuation. The employees don't have to contribute though, but they can if they want to. Whatever wage you're paid the employer also has to deposit another additional 9% of that sum in to your superannuation account.
We axed the old age pension here, I'm still not convinced that was a good idea. You can under special circumstances have emergency access to those funds but if you do that you're taxed at an astronomical rate. The account is supposed to remain untouched until official retirement age, at which time that money's tax free.
Currently here I think the official retirement age is 66 for men and 63 for women.
The US has largely eliminated pensions which is a shame. Retirement saving is not required by law here but perhaps it should be. We hear doom and gloom predictions about the solvency of the Social Security system from politicians all the time but none of them do anything about it. The official retirement age to receive full benefits here depends on the year you were born in. I think it was age 66 for me to obtain full benefits. If I had waited till I was 70, I'd get more money each month, but knowing my luck, I figured I'd die before then so I opted to start drawing SS at age 66.
The US currently taxes social security as income.