No one was talking about peaking. What you said was:
"once he passes 30 years old, his performance will start to decline."
This is a FAR CRY away from
"peaked after the age of 30". What I disagreed with was the 1st statement of declining after 30.
First off, I don't accept Dirk as being one. He had better years at ages 30 and 31 than he did at age 29.
http://www.basketball-reference.com/players/n/nowitdi01.html
Did you really bring up O'Neal? He was injured a HELL of a lot between 26-30. He don't count.
Time Duncan had a WAY better year at age 30 than he did at 29. (he shot .546 in that season man! That is his 2nd best FG% his entire career)
http://www.basketball-reference.com/players/d/duncati01.html
Then there's David Robinson. When he was 30 he was averaging the most rebounds since he was 26.
http://www.basketball-reference.com/players/r/robinda01.html
But lets talk about the one you really missed. Hakeem Olajuwon. From age 29 to 30 his scoring average JUMPED 5 points per. He averaged the 2nd most blocks per game in his career.
http://www.basketball-reference.com/players/o/olajuha01.html
29 to 30 is NOT the same thing as after 30. So, you don't think that players in general, or big men specifically, tend to see their performance decline after the age of 30?
Your examples actually make my case. Go back and look at the links you provided. With the exception of Hakeem, those players peaked at around 29 - 30 and saw their performance steadily decline AFTER the age of 30 - which is exactly what I said.
Go back and look at Dirk's advanced stats. His peak years were clearly at 26, 27 and 28 (league MVP). And based on his advanced stats, he was better at 29 than 30 and 31.
Yes, Duncan as better at 30 than 29, but not as good as he was at 25 (MVP), 26 (MVP), 27 and 28.
Robinson's peak years were at 28, 29 (MVP) and 30. At 31 he was injured and only played in 6 games and his performance steadily declined after that.
Olajuwon is the only one on your list that you could argue peaked at (or after) the age of 30. He had his best season AT 30 and won MVP at 31 - all the others mentioned won MVP in their mid to late 20s.
In the 57 years the NBA has been giving out MVP awards, eight MVPs have been won by players 31 years and older and 5 more by players at the age of 30. The other 44 MVP winners were in their 20s. And, here's the kicker, most of the players who won MVP after 30, won multiple MVP awards in their 20s (Jordan, Kareem, Magic, Wilt, Russell, etc.). In other words, even guys who were great in their 30s, were even better (aka: peaked) in their 20s. The only exceptions in the entire history of the MVP award are Nash, Hakeem and Malone. They account for 5 of the 57 total MVP awards.
And why not bring up O'Neal? Injuries are part of the aging process and is one of the major reasons performance declines with age. A few, very rare players, like Karl Malone, manage to avoid major injuries into their mid-30s, but they are very rare exceptions. I sure hope Aldridge is one of those rare exceptions, but it's not a give he will be. Aldridge missed more games last season (11) than Malone did the entire 18 years he played for Utah (8 total, 3 of those due to suspensions). So clearly, Aldridge isn't the iron man Malone was.
So, I stand by my original assertion that, like most players in the history of the league, Aldridge's performance will likely begin to decline after the age of 30.
BNM