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How old was the Fonz when Happy Days first started?

I was watching Happy days the second season and this question popped up! lol i mean the role of Fonz the actor!

Public Comments

1. he was born in 1945 and the show initially aired in 1974 thru 1984. That made him 29 when the show first aired and he was 39 in the final episode..
2. He was born in 1945 and started on Happy Days in 1974, making him 29 years old.
3. Everyone is answering the question of Henry Winkler's age . . . . Henry Winkler of course portrayed the character of "Fonzie" but are you asking the actor's age or "Fonzie's" age?