"I think it is tough for someone to reach 39 and still play for the top trophies," said the Milan defender after he starred in the 4-2 win over Boca Juniors.
"I am satisfied with what I have achieved today and throughout my career."
There were reports Maldini would hang up his boots straight after this Final in Yokohama, but he sets a firm date for his retirement.
"In June I will retire and certainly have no regrets. It is a struggle now and I have niggling pains, but I still have so much fun on the pitch."