The Word is:”child”
noun: child; plural noun: children
“she’d been playing tennis since she was a child”
synonyms: youngster, young one, little one, boy, girl; More
a son or daughter of any age.
“when children leave home, parents can feel somewhat redundant”
an immature or irresponsible person.
“she’s such a child!”
a person who has little or no experience in a particular area.
“he’s a child in financial matters”
the descendants of a family or people.
“the children of Abraham”
a person regarded as the product of (a specified influence or environment).
“a child of the Sixties”
Source credit: Google