Counterfactual
The Parallel Lives of Cori and Gillian
In 100 girls, Cori found its level. 50 years earlier, Gillian occupied that same statistical address.
1947–2025
Cori
Peak year
1977
Peak births
397
Latest count
100
Status
Stable
Peak generation
Gen X
1922–2025
Gillian
Peak year
1999
Peak births
1,022
Latest count
47
Status
Endangered
Peak generation
Gen Z
In 100 girls, Cori found its level. 50 years earlier, Gillian occupied that same address. One peaked in the Gen Z era; the other in the Gen X world. They never met. But the data remembers them both.