All depends on where you think one age ends and another begins. I use 18 to 35 for young adult and 36 to 65 for adult since most people I know in their 60s are not EA's definition of elder. Not even sure anyone under 70 fits that definition. For me, Adulthood is longer than young adulthood.
This thesaurus page is about all possible synonyms, equivalent, same meaning and similar words for the term cheeky. Princeton's WordNet(0.00 / 0 votes)Rate these synonyms: brash, cheeky, nervy(adj) offensively bold. Synonyms: cheeky, brash, jumpy, highly strung, nervy, uptight, high-strung, restive, jittery, edgy, overstrung.
Definition of cheek. 1 : the fleshy side of the face below the eye and above and to the side of the mouth; broadly : the lateral aspect of the head. 2 : something suggestive of the human cheek in position or form; especially : one of two laterally paired parts.