Age 59 1/2 or 5 years after first contributions are made, whichever is longer.
The alternative to any Roth IRA or Roth 401(k) is cash value whole life insurance policies. Unlimited contributions, guaranteed growth, 100% principal protection and guaranteed tax free death benefit.
Just because your employer offers a 401(k) program does not mean you need to participate. If you don’t get a big enough match to off-set the liquidity and cash flow, I wouldn’t do it.