Still young at heart but years ahead

Ever since I turned 20, my teenager cousin seems to have developed a problem with my age. "How old are you?" is the question she deliberately asks every time I meet her during the Spring Festival, and I could hear the stress on the word "old".

This year, I finally got to fight back and be mean for once when I unexpectedly found out she was 19. "Well in no more than a year you're 20 and then 30 will come very soon." But she was totally unfazed. I could see the pride in her heavily eyelinered eyes.

Later on, I got to thinking about age. Is it the reason my cousin behaved so arrogantly, I wondered?