Books

Interesting, learned from the book Good Strategy Bad Strategy that DARPA "retains program managers for only four to six years to limit empire building and to bring in fresh talent. The expectation is that a new program manager will be willing to challenge the ideas and work of predecessors"

Co-founder @bountycaster (bountycaster.xyz). Co-producer @ethereumfilm. Previously co-founder of Scalar Capital and product at Coinbase

One of consultancies I know of explicitly states, by the time you are 28 you either become a partner (rare) or go somewhere else. Same reasons. TBH, if you are 28 there, you have a line of willing prospective employers.