When Did You Realize You Are Getting Old?

I'm inside Walmart the other day and I am looking at cellphone cases. I have a problem with constantly getting new ones and finding something I don't like about it and buying another. But I digress, while leaving the area I see a little girl run up to her mother with a Taylor Swift CD saying "Mom? Can I buy this picture?" Her mother says "that's not a picture hunny it's a CD" The little girl who I estimate to be about 10 years old says "A CD... What's that?" Then it hits me. BAM! YOU ARE TOO OLD! When did you realize you were getting old? We'll discuss on air at 3pm!