In 2008, Kendrick Perkins was 23 and Rondo 22, so I find it hard to believe age is some overriding factor. Leon Powe also helped us win the title. He was only 24.
Jaylen Brown may be ready to be a key rotation guy on a championship team because he has an abundance of talent. Marcus Smart is emerging. Olynyk is extremely underrated but thankfully not by Brad, Danny and his teammates.
With Amir, Horford and Green, and with guys entering their prime such as Isaiah, Jae and Bradley, our team looks very balanced for age.