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>Males usually develop the illness in their middle twenties,
whereas females develop it in their late twenties (McGarth et al.,
2008). The average age of onset of disease is between 20 and
25 years for males and between 25 and 30 years for females.
Individuals with a family history of schizophrenia and those with
a history of obstetrical complications during birth may have an
earlier age of onset