past one's prime

past (someone's or something's) prime

To no longer be in an ideal state or condition. Many gymnasts are past their prime when they are only teenagers. This computer is so slow that it's definitely past its prime.
See also: past, prime

past one's prime

Beyond the peak of one's powers, as in Jean still plays tennis but at 79 she's obviously past her prime. Also see the synonym over the hill; prime of life.
See also: past, prime
References in periodicals archive ?
Baby boomers have traded in the traditional view of aging as being past one's prime for actively going after their "bucket list" goals.
Not to mention the pressure to keep working until the standard Silicon Valley retirement age of thirty, which may seem young to some readers, but is still well past one's prime skateboarding years.