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He's not obligated to prove anything to you. If you don't believe him you can easily look up the stat yourself.

They literally just made up a random number

15% of women ages 40-44 in the USA have never given birth, from which we can pull 85% of women ages 40-44 have given birth, as of 2014.

Wow, I got it right to a percentage point? I didn't realize it was 40-44, so maybe it moves teensy bit with IVF past 44. Thanks a lot for the cite.