There are many criteria to understand how old is a person. But if you ask a person "after 30", everybody will say you that he/she doesn't want to think about the age because "I feel young else".
I'm "after" too and am often surprized to hear what persons I know say when they speak about their age. In poor words the main meaning is: it's a tragedy and the persons are afraid to think about it. I don't know, nobody wants to be thankful to the life for the age. Nobody wants to remember that there are so many persons that die after the birth, at the age of some years ecc.
My personal behaviour is unusual. I think, my age is very entertaining. Because I am much more free as I was when I was younger. I have not to think to conquist, to demonstrate, to, to... Even in our society where nobody respects others, the age is respected. It's true. So, I can even do or say stupidities, and the younger persons have to show respect to me. I'm young, but I'm old enough to enjoy this situation. It's incredibly entertaining.
Don't you think so?
On the photo is italian scientist Rita Levi Montalcini, born on April 22 in 1909. Nobel Prize in medicine 1986. Don't know how it is today, but till a year ago I know, she was a head of her laboratory.