It arrives at different times for the offspring. Or more precisely, exhaustion arrives at different times for people in different times of their lives, and in different ways. There's a reason most people have their kids in their 20s, though. I didn't think early 30s was so old to have a kid, but sometimes I really wished for that extra decade of youth when mine was still small.
Because the exhaustion fairy is actually the energy redistribution fairy, and the energy they extract from the parents (which they can deal with after many years of pushing their exhaustion barriers by staying up late reading books on a school/work night) is passed over to the children.
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