Victory over Sampdoria saw Juve crowned champions.
Chiellini said: "This Scudetto was earned a while back and I think the final step was beating Lazio. We were waiting for it to become mathematically impossible to catch us, but we still want to play a great last month."
Juve switched from three at the back to four, sometimes asking Chiellini to play at left-back.
"As the years go by you are losing hair and pace, but gaining in other areas," he laughed. "I lost something in physical terms, but learned to think more and I think I'm in my football prime.
"The whole team worked hard, sweated for the result and suffered. I hope to be an emblem of those characteristics."