The reason that I trust the site that DarkAzcura and I are referring to is because on that page they actually link to who is on the rosters for each of the teams.
Their listing for the Celtics roster is spot on and looks up-to-date. They, for example, don't have Bynum listed as a member of the Celtics.
I won't claim to know which of these sites has the right numbers for sure.
DarkAzcura brings up some excellent points, however. Let's say your fifteenth man becomes the 23 year old Dwight Powell instead of the 32 year old Joel Anthony. Now, your team just became a click younger on average. Does anyone think that the difference in ages between Dwight Powell and Joel Anthony is going to be the difference between this team's chances at winning 35 to 40 games or only winning 25 games or less? I don't.
Yeah, exactly. Sure veterans tend to win more, but a lot of young teams win too. It's not as rare or uncommon as nick was saying.
Anyway, I calculated the numbers. Both websites are wrong, but realGM is "more right".
Basically, the website nick linked to calculated the ages based on their face value without taking days into account. So, sure Sullinger is 22 years old, but he's turning 23 in ~100 days. He's closer to 23 than 22. Bradley is 23, but he's actually 23.9. Much closer to 24 than 23. realGM takes this into account, but they haven't officially taken Bynum off so their calculation is still with Bynum on the team.
Nick's site took Bynum off the roster, but they calculate average age based off the raw number.
The actual average age of the Celtics is 25.3. Neither 25.8 (realGM) nor 24.8 (nick's site). That would still have us at 4th youngest, but honestly the difference between 4th and 9th youngest is 0.6 years. Meh. I'd be more interested in knowing the average age of each team's actual rotation. Leave the bench filler out of this. Players like Joel, Bynum, Young, and Powell just throw off the average in both directions and none of these players are going to play significant minutes most likely.
The difference between taking days into account or not plus Bynum or not just shows how minor age
can be in the NBA. We are still within the age range of Toronto, NOP, OKC, Phoenix, Portland, Houston, and Detroit.