I'm also learning Korean, but here's what I think. :) This is a bit formal, though, I think! 저는 스물세 살입니다. jeo-neun seu-mul-se sal-im-ni-da. I am 23 years old. Roughly: 저는 (jeo-neun) = I 스물세 (seu-mul-se) = 23 살 (sal) = age marker 입니다 (im-ni-da) = to be [am] EDIT: Sarah's comment adds more. :)

Cho-nun ee-ships-ham im-ee-dah :)