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I assume you mean for tours from the South (as opposed to those form the North, like the one contained in this report).
The Koreans have a useful website in English - Panmunjom , which states a minimum age limit of 11 years for Panmunjom JSA visitors from the South.
When you think about approaching the demarcation line of the Koreas from the South, you should consider three levels of restrictions, as you head north to Panmunjom.
1. Firstly you encounter the CCZ (Civilian Controlled Zone). Access is controlled by the South Koreans, and mostly just amounts to an ID check.
2. Secondly you encounter the DMZ (Demilitarized Zone). Access to this area is controlled by the UN, and you will require prior approval to enter. (Basically need to be booked on a tour.)
3. Thirdly you encounter the JSA (Joint Security Area). Access through the southern section of this area is controlled by the UN, and there are even further entry restrictions in place.
There are different points of interest to see in each of the three zones.
For DMZ tours, you should book with a tour provider well in advance. But note that for tours which include the JSA, availability dates are only finalised about 2 months in advance, and they are on selected days only. (And, tours may be cancelled at a moment's notice, due to training or other military requirements.)
Thanks for the explanation. Actually can children go to DPRK? Or what is the age restriction?
We visited that exact same school and saw the same performance by, I think, the same children!
Now that's spooky!
You mentioned that you went during winter / or just after (different countryside landscape). What made you choose to go then?