Recently we have come across a puzzling observation that being
conceived to particularly young mother (age below 25 years) increases
the chances to survive to 100 (odds ratio is close to 2.0).
Any ideas why is that?
Surprisingly there is no much difference between the 25-year and
45-year mothers in this respect. So this is not a deterioration in
later life, but rather a kind of the early-life "credit", which is
rapidly exhausting and then the age effects become negligible.
Is it possible that the best most vigorous eggs are used first, very
early in life?
Any other ideas?