The birthday appears to be off because the age gap between his wife and himself is 18 years?

Question

Marriage date shows he was only 12.

Answer 1

Eighteen years: Far Apart, yes, but impossible, no. My gma and gpa in SW Texas were born exactly that number of years apart. Tiny, isolated town, no likely candidates.  Oh well.

 

The problem that Peter Schmidt sees is a problem of the man's age--12 is unlikely, true.