So I was looking at the faculty pages of a few University's and it seems to me like the Professors are getting to that retiring age. On the website for the Plasma Physics department at Princeton, the earliest year that a Professor/lecturer/anyone got a PhD was like 1985, most of them were mid 60's to mid 70's. Anyways...it seems to me that they are getting older, so I was wondering, does anybody have any opinions as to what the future as in store for Physics PhDs? Will a lot of Professors be retiring soon? It seems that because a lot of Physics Professors are older makes it seem that in order to get a professorship, you have to put in 20 years as an assistant professor.