As someone smarter then me said once, "When I was 20 I knew everything, now that I am 50 I know nothing."
When was this? 1910? Sounds like you're idealizing history, and in particular Hollywood, just a tad.
It's just as likely that those old films you love starred vapid bed-hopping screwed-up people who Moved To Hollywood To Make It Big, as it is now. Did Alfred Hitchcock or Orson Welles, or Norma Jean Baker (oh, sorry, "Marilyn Monroe"...) really ever "live real lives" as adults? I guess I just wonder who you think you're talking about here.
The people who make movies today grew up watching movies.
This was also true in 1970, 1950, and probably even 1935. Movies've been around, and popular with the young people, a wee bit longer than you seem to think.
Sure, levels of wealth may differeniate the stage props, but isn't the script familiar? Let's all get rich! Make your mark on the world by aquiring as many goodies as you can afford and experiencing as much as possible.