Madoff spent ~12 years in prison before he died at 82.
They gave him a 150 year sentence for a crime on par-ish with SBF's crimes, because at 70 there is little difference between 20 years and 100 years, so you may as well go for the shock value.
He was already old so he was going to die in prison whatever happened.
150 years - of which he served 12 years before dying in prison.