What was the first year for the Dodge Challenger?

My '66 Ranchero was made on my 9th birthday in '65 .. Dad traded in a really cool '60 Ford short bed for it .. When I got the Ranchero and a job and money .. I had it painted the same color as the '60 short bed was .. Dark dark green metallic .. Corvette or Caddy color, don't recall for sure