Victoria’s children didn’t all outlive her. Three (Alice, Leopold, Alfred) died in her lifetime, and one (Victoria Jr) survived her by just six months.
Agreed, however, that having 9 children who were all well into adult life before any died was unusual.
A couple of random thoughts. I wonder how many women in the Amazonian forest, or even foraging along the shoreline in the stone age, went through 18 pregnancies without a successful outcome. Maybe something to do with unnatural lifestyle, ignorance of nutrition and maybe too much reliance on religion? And, yes, there were baby booms after the two world wars. but having been born in 1950, in according to my calculations a baby bust not equalled until the Abortion Act of the 1970s, I feel short changed at least socially.