pubescent

(of animals especially human beings) having arrived at the onset of puberty (the age at which sex glands become functional) but not yet fully mature; "the budding breasts of a pubescent girl and the downy chin of pubescent boy"

ड़िजाइनर तरुण ताहिलियाणी की साड़ियों में अब लेक्रा भी होती है.

The teenagers are called pubescent.