How Old is Too Old?

When I was 18, I felt old because little kids in my class were already green and blue belts. This time around, since my taekwondo class is in my university, the gap isn't as large and everybody is just starting. On the other hand, everybody seems to be an undergraduate! I feel old now not only physically but also mentally. One night after class, my partner of the evening asked if I was a freshman and what major I was in. He was shocked to hear I was a final year PhD student.

Oh well...I'll have to take it as a complement that he thought I was a freshman. But some part of my mind puts it down to HIS inexperience!