Answer:
20 years (October 15, 2001)
Heeseung
19 years (April 20, 2002)
Jay
19 years (November 15, 2002)
Jake
19 years (December 8, 2002)
Park Sung-hoon
18 years (June 24, 2003)
Sunoo
17 years (February 9, 2004)
Jungwon
16 years (December 9, 2005)
Ni-Ki
