Hollywood careers that just ended abruptly

Post 1945 a host of actors arrived in Hollywood such as Kirk Douglas, Lee Marvin, Paul Newman, Ernest Borgnine, Charles Bronson, Audie Murphy etc who had fought in WW2 and acted in WW2 movies.

They were real tough dashing men who had seen combat were suffering from PTSD heavy boozers serial womanizers could play vulnerable romantic leads and convincing soldiers cops cowboys gangsters and heroes.
Men and boys wanted to be like them and woman swooned over them.
Somewhere along the line that earthiness was gone.

The biggest stars of the 1960s 1970s 1980s and 1990s like Clint Eastwood, Robert Redford, Steve McQueen, Warren Beatty, Robert De Niro, Bruce Willis, Sean Connery, Sylvester Stallone, Kurt Russell, Arnold Schwarzenegger, Brad Pitt and Tom Cruise grew up in this masculine WW2 environment.

It hasn't disappeared in the real world. Guys like that still exist but they aren't being recruited by Hollywood. However leading men under 40 these days are pretty not handsome, do not have that raw masculinity and when they try to act that way on screen it comes across as phoney.

The likes of Chris Hemsworth for instance although muscle bound and Aussie is a boring drip. His equivalent in the 1940s and 1950s would have been Victor Mature or Charlton Heston or Robert Taylor who oozed charisma.