Pat Morita was 56 in The Karate Kid Part III when he played the character 'Mr. Miyagi'.
That was over 35 years ago in 1989.
In 2005 he died aged 73, starring in 93 films in his career, 59 of those after The Karate Kid Part III was first released. If he were alive today he would be 91.
In The Karate Kid Part III, I think Pat Morita looks: