You know you're getting older when...

[Thaliat Everwood]

You know you're old when your favorite TV shows are playing as reruns on the Retro TV station.  

[Indigo Project]

... when that baby you remember holding when he was a week old is getting ready to start high school.

... when you look in the mirror and think about how it used to be.

... when you have to explain what dial-up is/was.  

[Miss Sane]

You become the next spokesperson for Lipitor.  

[aretoo]

...You remember a time before every movie had a video game tie-in

...You remember a time before everything under the sun had its own web-site  

[Kalstolyn]

... that baby you once held in your arms is now GRADUATING from high school and has a girlfriend...

... that preschooler you used to look after now has a son who is about to start kindergarten

... your baby brother buys a house

... you hate the "new" incarnation of BSG (yes, I know it just ended) because it is such a horrible bastardization of the original that you knew and loved

... you remember discussing the invention of the "compact disk" at school during Current Events and thinking that you would probably never even see one of the mythical objects

... you remember a time before cell phones

... your first computer ran on cassette tapes  

[Essence of Crayon]

...people a year or so younger than you start calling you "Lady"

...you've seen a rerun episode of The Simpsons over 40 times on television

...and that you remember practically every single line from it  

[Blade_With_A_Name_On_It]

.... it takes you, like, five minutes to understand the text that was just sent to you because it's in leet.

.... when you realize that your sense of humor has changed but everyone thinks it's the same.  

[xDarkPisces]

...when you remember a time before every band had its own clique.

...when your music tastes are considered "out-of-date" by younger acquaintances.  

[Ogyshi]

... when you blow out a candle and it adds 40 years to your life.

..(I was playing Sims 3 today. It was really depressing.)  

[^^Psycha^^]

I knom getting old when my hair is turning white like the old people crying  

[aretoo]

^^Psycha^^

I knom getting old when my hair is turning white like the old people crying

rolleyes Pfft... I had grey hair in high school... smile  

[Serious Erius]

...when it's the twenty second of june...
And when You look at 1990 and go "heh" and then realize thats its actually 19 years ago...
Etc ._.  

[Kalstolyn]

... when you fondly remember Sesame Street from before Elmo existed.  

[Erverain]

You know you're getting old when you realize that Viagra is actually a useful product. For personal use, anyway.
Also, you know you're old when you stop caring about being a curmudgeon.  

[God-Raped-Me]

When kids are talking about Pokemon and the only thing you can say is "Whaa?"