Collocations for teenager - noun

older, young
a young teenager of fourteen

normal, typical
She's just acting like a normal teenager.

awkward, gawky, shy
fresh-faced
impressionable
moody, rebellious, stroppy (BrE,informal), sulky, surly, troublesome
angst-ridden, depressed, troubled
bored
drunken, rowdy, unruly
Residents have been disturbed by large groups of rowdy teenagers.

horny (informal)
pimply (AmE), spotty (BrE)
gangly
He had grown from a tall, gangly teenager to a handsome young man.

lovesick (often figurative)
He's acting like a lovesick teenager.