The median age of my Facebook friends (those who share their birth year, so N=106) is 43. However, the youngest is 16 (friend of the family, so don't get creeped out), and the oldest shows up as 100.9 (one of my lying friends, I think, or else she looks really good for her age).

If instead I calculate age based on when they graduated from high school (tricky! Assuming most people graduate at age 18), then N=185, Median=44.35, Min=16, Max=69.