I would like to go back and earn my PhD in Philosophy...I am 30 now, so I finished my BA in philosophy some time ago. I was looking for any advise on starting this process. Specifically, my mentor from undergraduate has left the program and is no where to be found. Add to that the two other professors I was close to have retired without leaving forwarding information. I am nervous that I will not have letters of recommendation. Any way to deal with this situation? Should I audit undergrad glasses for the next year to build new relationships?

Thank you,