I would put myself in stage 5 and have been there awhile.
An observation I have made would be that the age may not move hunters into this stage as much as having someone else to teach and share thier hunting with.
I know at age 32 I have a 5 year old son, 2 year old daughter, and a wife just starting to shoot the bow. To me it is much more important that they have a good time than it is to shoot a animal. No matter what it is.
I have started to look forward to hunting tree rats again with my son. Just like I started out. And my daughter may be the most avid hunter of the two. She follows me around for hours while I am practicing with the bow.
There is no doubt that as they get older I will be giving up more of my hunting equipment to buy them equipment. More of my hunting time to teach them the sport I love. And loving every minute of it just as much as I would have if I shot the next world record whitetail.
Wait a minute what did I just say... I take that back if a world record whitetail steps out I'm taking thier bow away to shoot it myself...