teenager
/ˈtiːnˌeɪ.dʒə(ɹ)/noun
A young person aged from thirteen to nineteen.
'Teen' is the common short form, especially in headlines. 'Adolescent' is the formal or clinical equivalent.
Related words
adultSomeone who is old enough to be legally considered grown up.toddlerA small child, usually between one and three years old, who can walk but is still a bit unsteady on their feet.elderAn older, respected member of a community or tribe who is looked to for advice, guidance, or ceremonial duties.relativeA member of your family, whether related by birth, marriage, or adoption.ancestorA family member from past generations, on either parent's side, from whom a person is descended.strangerSomeone you have never met and do not know at all.