Final answer:
The average age at which a female from the 1975 cohort reproduces is between 25 and 30 years old, with peak fertility in the twenties and a decline starting in the thirties.
Step-by-step explanation:
The average age at which a female from the 1975 cohort reproduces is between 25 and 30 years old.
Fertility for women peaks in their twenties and starts declining in their thirties. After the age of 35, fertility declines more rapidly until it ends completely at menopause.
It is important to note that individual variations exist and factors such as health and lifestyle choices can also impact fertility.