My Colorado state form is giving me a tabor refund but I was not 18 on January 1 2023. My birthdate is correct in the system so why is it calculating the refund?

Based on what you input in TurboTax, you're eligible for the TABOR credit.  You don't have to be 18 or older to claim it.

 

A taxpayer under age 18 can claim the credit if they were a full-year Colorado resident during the tax year, and have a Colorado tax liability or are claiming a refund of Colorado wage withholding from a Form W-2.

 

According to Line 34, State Sales Tax Refund in the Form DR 0104 Booklet:

 

If you are a full-year Colorado resident who was under 18 as of January 1, 2023, you may claim the state sales tax refund only if you have a Colorado tax liability (line 14 must be greater than 0) or you are claiming a refund of Colorado wage withholding on a W-2. Your return must be postmarked by October 15, 2024.

 

[Bolding mine.]

 

See also the Colorado Department of Revenue's Taxpayer's Bill of Rights (TABOR) Information for more information.