human
On the whole it would appear, so far as the evidence goes, that the fathers of our eminent persons have been predominantly middle-aged and to a marked extent elderly at the time of the distinguished son's birth; while the mothers have been predominantly at the period of greatest vigor and maturity and to a somewhat unusual extent elderly. There has been a notable deficiency of young fathers and, still more notably, of young mothers.
gpt
The Age of Parents: Its Effects upon Children
human
The children of elderly mothers show a tendency to superiority throughout.