Mission. YAI helps children and adults with intellectual and developmental disabilities achieve the fullest life possible by creating new opportunities for . Get answers from Young Adult Institute staff and past visitors. Ask a Question Thumbs Down Thumbs Up. Not rated yet 0 Votes. Reviews for Young Adult Institute. Write Location: E 36TH St, New York, , NY. Young Adult Institute in Elmsford, reviews by real people. Yelp is a fun and easy way to find, recommend and talk about what’s great and not so great in Elmsford and ukrainianblog.infoon: 33 W Main St, Elmsford, , NY.