After recording the same amount of goals and only one more point in the last 2 years bertuzzi is likely somewhere around 80-90% in his development as he has only just completed his 3rd full year and the coaching staff/team likely held him back just a bit.
I don’t think that until a player hits their late 20’s can you pin point development on age. It’s more a basis of year to year improvement. In Calgary for example we have Sam Bennett and Andrew mangiapane both 24 years old. Bennett just finished his 5th full season and in each of those he’s hovered around 25-30 points, he is likely all he ever will be. Mangiapane who just finshed his 2nd year (68 games this year 44 last year) seems to be progressing and most fans believe he has a good amount of unlocked potential left to hit. Sure he probably got a boost playing a top six role this year versus ahl/4th line last year but if he hadn’t developed he likely wouldn’t be good enough to earn that spot.
- RedC21
Study after study after study after study consistently finds that skaters, on average, peak between 22-25.
https://www.sbnation.com/...-stats-rates-age-analysis
https://hockey-graphs.com...s-for-nhl-skaters-part-2/
https://model284.com/my-m...nday-hockey-aging-curves/
To take your example of Mangiapane, it's not like him only having two seasons of NHL experience is exceptional, either. Case in point: this season there were 99 NHL rookie skaters who played at least 11 games, with a median age of 22. Mangiapane's age during his rookie season? 22.
That all being said, I think we're talking about slightly different things here -- namely what's possible versus what's probable.
Do some skaters continue to improve meaningfully after turning 24/25 years old? Sure. Not everyone follows the exact same curve. There are exceptions. Some peak a little later. And some peak super duper early. Bennett may have peaked at 20. It happens.
But at the same time I would say that you generally shouldn't
project that a 24-25 year old is still going to improve significantly (or at all), even if it's still very early in his NHL career. Fans have a tendency to estimate how much "untapped potential" a player has more on the basis of how long they've been in the NHL than by how old they are, but that doesn't seem to really have much statistical support.
This part is more my conjecture, but I continue to suspect that most of the time when we see a player "peak" statistically at a later age -- say 27-29 -- it's probably not because he got significantly more talented after age 23-25, but more likely that he was underappreciated and underutilized before.
Coincidentally I think this is also why the conventional wisdom that defensemen and goalies peak later than forwards is probably false. Defensive skills are much more difficult to evaluate than scoring skills, and goaltenders require thousands and thousands of shots faced before their stats stabilize. I suspect that it isn't so much that these players peak later as it is that it just takes longer for us to be able to identify who the truly good ones are with significant confidence.