While all three mothers survived to old age.

Half of the missing population would be absent because one of their parents would not have survived to reproductive age.

Balan survived to almost centenarian age, he died in Sofia on 12 February 1959.

Since most people now survive to reproductive age, according to one view, natural selection is being robbed of its most important raw material.

It is well documented that men are less likely to survive to old age than women.

Additionally, early and frequent childbearing and breastfeeding probably reduced the rate of breast cancer development in those women who did survive to middle age.

He married Frances Augusta Pierrepont in 1802 and together they had eight children but only four survived to adult age.

Q: Do many young lobsters survive to old age?

The great majority (80-99.99%) of individuals born do not survive to reproductive age, with perhaps 50% of this mortality rate attributed to predation.

It also meant that more survived to breeding age and that the gene pool suffered as little reduction as possible.