schizophrenia "relatively uncommon" after 30

"Three-quarters of the individuals with schizophrenia, develop the disease between the ages 16 and 25. It is relatively uncommon after the age of 30,"

Weird, that in an individual schizophrenia "is relatively uncommon after the age of 30". I was "relatively uncommon", as I was said to be an individual "with schizophrenia" after the age of 30.
Also, schizophrenia is more uncommon in women than in men.

I am female.