It's a proven fact. Children of fathers aged 50+ do less well in IQ tests according to a recent study.
Conversely, children of older mothers fared better in the same thinking and reasoning exams.
Recent old dad offenders:
57-year-old Paul Stanley.
Tommy Hilfiger, also 57, has an expectant wife.
And relative youngster at 55, Tim Allen, improving the home.
James Taylor who'll be 61 in three days has 7-year-old twins? (Ah, via a surrogate since the third wife wasn't wildly age inappropriate.)