grown-up
adjective
• adult.
• "Joe has two grown-up children"
grown-up
noun
• (especially in children's use) an adult.
• "I don't like it when grown-ups get all serious"
Similar:
adult,
grown person,
grown-up person,
mature person,
woman,
grown woman,
mature woman,
man,
grown man,
mature man,
lady,
gentleman,