tensomething adjective 1noun 1number 1forms 1 adjective1 •Aged between 10 and 19, inclusive.[…] Jones’ tensomething son is all sweetness and light, emotionally supporting his mother as she goes through the difficult first few days of a new job. — 1991 noun1 •A person whose age is between 10 and 19 (inclusive).Marshall Herskovitz, having a crack at working with tensomethings. — 1991 number1 •Any whole number between 10 and 19, inclusive.> 1) is everybody reading uk.misc twentysomething? / Well, I'm tensomething (nineteen :-) — 1993 formstensomethings