Within a marriage, your description of the male dilemma is true. Outwith a marriage, it is not.
There is nothing keeping a rich 50 year old from dating a hot 22 year old and trading her in every 5 years. But what a lot of women look for is safety and security. And it's not really that safe and secure if you can be kicked penniless to the curb any old time. So for the rich man looking for the young dime piece to entertain him, it would be better to keep your relationships short lived, as a womans comfort with short term security will usually give way to the desire for long term security. And stay away from those anchor babies.
For a marriage partner, I would advise a man to find a woman who has already seen to her own safety and security to some extent. Unfortunately a lot of men, though they would never admit this, like the power dynamic of having a dependent woman, and they like the feeling of being needed.
At the end of the day, if you don't want a overly needy woman, you need to live without being overly needed. And that right there is just fine with me.