President James Monroe to wed

James Monroe (1758-1831) was the fifth President of the United States from 1817 until 1825. He married Elizabeth Kortright in 1786.

Suppose James Monroe is only forty years old when he is the President in 1817.
Suppose James Monroe is a bachelor. Who shall he marry?
 
Suppose James Monroe is only forty years old when he is the President in 1817.

For that to happen, he'd have to have been born 19 years later, which means he'd have been conceived later, which in turn means he'd have come from a different spermatozoon and egg - so he'd be a completely different person. The idea of such a person just coincidentally becoming President at the same time as his OTL "counterpart" (more like a sibling, really) is extremely implausible.
 
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