If I was born in 1966 do I still need to take the bow hunter course to archery hunt?

Since you were born before January 1, 1975, you don't have to take a hunter education course to hunt in Idaho. Archery hunting requirements are not tied to your birthdate or age.  Every hunter who wishes to hunt in an archery-only season in Idaho  must purchase an archery validation and to do so you must provide proof that you have taken archery education in Idaho (or any other state) or that you have experience hunting in an archery-only hunt in Idaho (or any other state).