From my birth certificate, I'm 73 years old. That's old- just ask any teenager. But I don't feel 73. I'm not a kid, but I don't feel old. If I were to guess the age I feel I am, rather than the age my birth certificate says I am, I would say I'm 18ish. Now, this is the age I feel I am. Granted some days first getting out of bed feels like I'm so old nobody has ever lived that long. But the age that's rattling around in my brain is 18. How old you think you are?