It's been an established fact that some of the greatest NBA players have had major success after even age 30, and some even deeper pass that age. Hell Kareem Abdul-Jabbar won a playoff MVP at age 37 !
Jordan at 34 averaged 28.7 points and played 38.8 minutes for 82 games in 1997. Jordan never shot over 50% again after age 29 but that was due to one year off and secondly he became less reliant on his athleticism.
Larry Bird at 35 still averaged 20 points a game while playing 36 minutes on top of that. Yeah he had back problems on the tail end of his career but his problems were a byproduct of how physical the NBA was during the 80's.
So let's trash this whole younger is better than older theory now. Fact is it's been more players having far more success than guys even in the peak of their top 20's. Bottom line is most NBA players don't reach their apex until about ages 26-30 anyway. I'm talking that age where the game comes flawlessly to guys.
Fact is it's not too many NBA teams that have won championships with a roster full of 20 somethings. One of the youngest teams to win and NBA title were the 77 Blazers and the 82 76ers.
I think this chart will prove I'm right......

Now how many do we see below that age 25 line ?
So let's come off that it all about being young BS. You gotta pay dues in this league before you pop corks. Yeah OKC I'm talking about you too and any other teams and it's fans that think your youth will be the reason your team wins. History has proven otherwise.