Well if you look at the data, there's not much movement before age 24. The "getting younger" is mostly 27-29 years old that are more present in the league.
And where are teams finding these mid 20s players to fill out their rosters rather than paying over the hill guys in their 30s?
In fact, the number of players aged 19-20 has decreased which would point to the CHL age restriction for the AHL a moot point.
I don't see at all how that would make it a moot point. You have to be pretty special to play any substantial time in the NHL before your 21st birthday. There's a whole other tier of players in that age range that are too good for the CHL but not ready for an NHL roster spot.
Also, while it's interesting, other factors could explain the variations. For example, nothing says that talent is spread evenly between the years, or that players can play their game past 31 evenly from each draft. There's also the fact that there are now more players than before due to the various expansions, and those additional players may have a shorter window in the league (say 27-29) in comparison, increasing the weighting of the players in that age range.
Yeah I mean, that's all fair. Definitely it points to careers for the middle of the lineup players getting shorter. That's why I think getting a pro opportunity sooner is a good thing for guys looking to prove themselves. If you're on the farm team roster you are closer to that NHL opportunity than anywhere else.
In general, I don't think the AHL is a good development league, especially for younger players.
Why? Chances are if you weren't a top 10 pick or coming from Europe NHL ready you're going to be spending time in the American league. Which is where you get more familiar with the organization and they get more familiar with you. You learn pro systems that junior hockey don't employ, learn how to play pro defense and all the things that come with it, you get familiar with your org's other prospects and develop chemistry, you get access to NHL teams strength and conditioning coaches. Nutrition specialists, skating coaches, etc.
This isn't directed at you but I don't really understand this forum's contempt for the AHL. With how watered down the KHL has become it's the 2nd best hockey league in the world. The style of play is fast and definitely the closest you'll come to familiarizing yourself with the NHL game.