PetSmart Charities Associate interview questions

Went to the store, was on time and waited 40 minutes to be interviewed, mind you this is for a part time minimum wage job...then was told the person who really needed to interview me was too busy and made me comeback. I asked specifically if the job was still open because I did not want more of my time wasted. They lied and said yes, and said I would hear back by the end of the week, which I did not. They seem very disorganized and affected, They seem to only hire young people which is age discrimination.