In all probability it was likely felt that after a certain amount of experience it would lend itself to "safe" hunters. So those that already had 20 or 30 years experience were deemed to be reasonably safe. However this has not played itself out. Statistics show that older hunters (those with experience but no hunter safety) are the cause of a high percentage of hunting accidents. Another thought may have been "you can't teach an old dog a new trick". It may have been felt that older hunters are just not going to change their ways, though that does not excuse not trying. I think everyone knows a few older hunters without HS that are downright scary to hunt with. I am not required by ND law to have it but it was required for me in MN before I moved back here. What probably should have been done was an abreviated program for those born prior to "61" and a stagered compliance timeline.