At what age is social security not taxable?

Typically, Social Security is no longer taxable at ages 65 to 67. The current retirement age in the U.S. is 66, so that's why you can expect to receive full Social Security retirement benefits tax-free once you hit that age.

However, it is worth noting that depending on the income you've earned, you may or may not be eligible to receive tax-free Social Security by age 62.