I routinely feel old for my age. I listen to old music, watch old shows, enjoy old movies, read old books, and find myself talking to people at least twenty years older than myself. In my teenage years, peopled called me old all the time, and always thought I was older than my brother, who is four years my senior.
Because I matured so quickly, I have to consciously look for things that make me feel young. I feel young in the summertime, when I go barefoot and go running across the fields, just to feel the ground under my feet and the wind in my hair.