Date a 20-year-old, but do not marry her.
Do realize that when you’re 70 and she’s 45, she’s going to want to hang out with her friends, go on vacstions with them etc. and not want to be at home taking care of an old geriatric guy. Then she’s going to get nasty and mean and make whatever’s left of your standard life miserable. She’ll blame you every day of robbing her of her youth and of her life.
Bogie and Bacall were from a different era and generation. It was a thing of the past — a thing of beauty.
I am just kidding. 70 is the new 50, right? ;)