I worded that poorly, I apologize, what I meant was that the few instances that follow the perceived scoring model are usually players that enter the league as teenagers. the Crosby's and Ovechkins, and their declines at earlier ages are often due to injuries, as they have a lot of miles on their bodies at a young age.
That final paragraph makes very little sense. If you truly believe there's no way or point to take a look at thousands of players and make generalizations I don't know what to say. I find that profoundly myopic. It's certainly appears supported by 'overwhelming factual.. career statistics' that players score more points earlier in their career than later. There was no data manipulation in compiling raw scoring totals.
What I am saying is that the statement that player's scoring peaks in their early 20s is not statistically a thing. I believe it is data manipulation, as they are including the D and bottom six players that typically enter the league at 25+ into the equation and the snapshot of scoring by age drops dramatically due to the faulty science behind the data collection,
Let's look at any random sample. Let's take the remaining playoff teams and look at their top 5 players top scoring years(PPG - not total points due to missed time and shortened seasons). (I will exclude players 23 and younger because we can not know how they are going to score at 25, 26, 27+ etc yet.
Player - Top scoring age year
Carolina
Aho - 26 (so far, he is only 26)
Teravainen - 24
Skjei - 30
Burns - 33
Noesn - 31
Boston
Pastrnak - 26
Marchand 30
Coyle - 31
Zacha - 27
Debrusk - 26
MacAvoy - 24 (but he is only 26 and has started each of the past two seasons injured, and his point totals are not far off that 24 season)
Florida
Reinhart - 28
Tkachuk - 25
Barkov - 23 (came in as an 18 year old and got injured at 24 - this is what I was referring to above)
Verhaeghe - 27
Bennett - 25
Rangers
Panarin - 32
Trocheck - 30
Kreider - 31
Zibanejad - 30
Fox - 26 (this year he is 26 and has his highest PPG number, but missed some time with injury.)
Would you like me to continue with the west? It's the same story. Mackinnon -28, Rantannen -26, Druoin -29, Nichuskin -29, McDavid -26, Hintz - 26, Draisaitl -27, Nugent-Hopkins -30, Pavelski - 37, Duchene - 30.
Take any team in the league. Look at the roster up and down. Look at all the players top scoring years, and you are going to find very few who peaked by 23. It just is not a thing, and I can not for the life of me figure out how these folks came to their conclussions. It has to be measuring points scored by age league-wide, and the 25 age range drops off as a whole when looking at the entire league because that is the age D and bottom six defensive players typically become fulltime players in the league (on average) and their data joins the datapool.