Korean age dates back to the moment of conception. They consider time spent in the womb as time being in existence. The moment you are born you are also one year old. The formula is something like current year, minus birth year, plus one year.
I'm not Korean, so my math could be off. I only know this from dating Asian guys. It is just one of those things I wish I didn't know about actually, like "fan death" and such.
Asian guys just say this so they appear older and more sophisticated. It's all just a ruse.
Unfortunately not all men are born with your natural sophistication and charm, Mr. GOH!
But they can try!
Why, of course not; very few reach the rarefied heights of genteel refinement and savoir faire I enjoy.
But in the interest of fairness and full disclosure, as a white male, I am culturally obligated to engage in puffery regarding the amount and length of my workouts. A handy rule of thumb; reduce any numbers a white male uses to describe his fitness routine by at least 25%. This applies to weight he's able to lift, length of his cardio routine and waistline inches lost, among other things.