(human) life (i.e. conception to death)

Middle performers have no problems and therefore are left alone for better or worse by the company until their mid-30s to mid-40s, when they are in the prime of their working lives, and when they finally reach their mid-40s, they are treated as low performers and subject to release, which I felt was a terrible thing, but on the contrary, if they knew such a future was waiting for them in ten years' time, However, if they knew that such a future would be waiting for them in ten years' time, they would have a sense of crisis and could take measures to prepare for it from their early 30s.