Comment by Sandstone on Maseki Gurume: Mamono no Chikara o Tabeta Ore wa Saikyou! - Chapter 75

@Sandstone with hardships comes wisdom and clarity. Time give more opportunities to suffer from hardships and grow but doesn't warrant them.

That why you find some old people still immatures, clever youngsters, brats just being bratty and elders of unreachable wisdom.