What Does "Old" Mean Anyway?

About a month ago, I overheard a small group of my students talking about television shows.  Here's how it went:

Student 1:  "Yea, so my mom was watching Friends last night.  It's so funny."
Student 2.  "Oh, I hate that show!  Those people in it are SO old."
Student 3.  "No kidding.  That one lady is in that Cougar show?  It's so lame."
Student 1.  "I know they're old, but I still think that show is funny."
Student 2.  "Yea, but it plays on TBS!  Any show in reruns on TBS is old."
Student 3.  "Besides, the way it's filmed is so old fashioned. Did you know that show started like when I was born?!?"
Me:  *Horrified and sobbing at my desk!*

After hearing that conversation, I had a bit of a moment.  Friends was one of those shows that frame worked my 20's.  To me, Ross and Rachel were the bomb, and who didn't listen to U2's The Joshua Tree religiously after Season 2? 

Thanks to this conversation, I started watching the seasons again, and all of a sudden things had changed for me. Listen, I still love me some Friends and am reliving all the moments from my 20's that I wish I could get back, but...am I old?!? Nah!  Really, I'm just feeling a bit nostalgic, but who knew Friends would be something to be nostalgic about already?