age of mr stone

Algebra Level 3

Ben wanted to know how old his friend Mr. Stone was. Mr. Stone told him, "I started school when I was 4-1/2 year old, and I stayed at the same school for 1/6 of my life. I was in the army 1/5 of my life and when I left the army I spent 1/4 of my life as a clerk. Now I have spent 1/3 of my life in retirement." How old is Mr. Stone?

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