Adults aged 16 years or older must purchase and have in their possession a fishing license in order to fish or take any fish in Colorado. Youth aged under 16 years old may fish and take a full limit without a license. Seniors aged 64 and older can obtain a fishing license for $1 (.25 search and rescue fee, .75 Wildlife Management Education Fund Surcharge). Everyone who fishes with a second line, MUST obtain a second-rod stamp. A fishing ticket for not having a license (or the right license) can have lasting repercussions on your ability to hunt and fish nationwide.