Why would you marry someone with a 20 year age gap knowing they are "Likely" to die long before you do and men already generally die earlier?

I've seen some attractive older guys.

The first point of me getting into a marriage would be love and hopes to live a long life together. I don't like starting over romantic relationships.

So what about you.
Why would you marry someone with a 20 year age gap knowing they are "Likely" to die long before you do and men already generally die earlier?
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