Definition: Generate an overlapping word between the given two sentences. When you find the overlapping words, they don't have to match exactly, e.g., "survival" and "survive" are valid overlapping words. Little words like "the" or "of" don't count! You must generate significant words which are not the stop words.
Input: Sentence1: For adolescents, ages 12-18. 
Sentence2: Ages 12-18 is a time of significant mental, emotional, and social changes.

ages