There is a little caveat here. A Jr. hunter does not need state stamps as long as he/she can hunt with a Jr. license which includes the season in which they turn 16. But (and it's a big one) as soon as a Jr. hunter turns 16 he must have federal duck stamp. That's why on the back of the Jr. license there is a place for the federal duck stamp but not a space for any state stamps.
So for example:
1. The licenses come out in May.
2. Junoir may purchase a Jr license as long as he is not yet 16.
3. Junoir may hunt ducks without a federal stamp or state stamp.
4. Junoir turns 16 on January 19th.
5. Junoir must buy a federal duck stamp to hunt the last weekend of duck season but he does not need a state duck stamp.
Another screwy law is this thing about 16 year olds with junior licenses that cant hunt on junior day. It dont make much sense to me. If they have a junior license they should be able to hunt on junior day.....