About four to five months old.
Based on that age, I would say it's a pullet.

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About four to five months old.
Your rooster is a Black Sex-link rooster.
This hen is a Production Red/hatchery quality Rhode Island Red.
This bird is a Red Sex-link pullet. Red Sex-links are known by many names, including Red Stars, Isa Browns, Golden Comets, etc., but they are all basically the same thing.
Mixed breed pullet. Probably has some Light Brahma in its background.