'Those careers are now few and far between. About 60% of life scientists who earned a Ph.D. in 1963-64 secured tenure within 10 years. But by 2021, only 3.5% of biology Ph.D.s working at universities had been tenured within a decade of graduating, according to a National Science Foundation survey.'

https://www.statnews.com/2023/06/06/postdoc-system-teetering-imperiling-life-sciences-diversity/