I've had the same experience as the OP ever since I came here. Actually, on my first day at school, the principal asked me three questions. He had the secretary interpret for me.
1. How old are you? -26/28
2. Are you married? -no
3. When will you get married? -umm...
The third question was a little shocking for me, but it really shows the difference between the Korean and Western views of marriage. In Korea, you get married according to a schedule. You approach a certain age and then you look for someone to marry as soon as possible. It's even common for people to get married who have known each other for less than a year. Personally, this system doesn't appeal to me at all, but this is probably because I was raised in a different culture.