Southwest Airlines Part-time Customer Service Agent interview questions

I applied online. I was contacted and scheduled for a phone interview. The phone interview went fine, mostly questions about my past experience. I was then set up for a face-to-face interview with a Human Resource interviewer and the manager. I thought the interview went well but I was not offered a job. In all honesty I think my age (55) and being slightly overweight (size 14) is why I was rejected.