Eye exam (eyeglasses only) - $60. Contact Lens eye exam - $90 (includes eyeglass exam) Pupil dilation and visual fields costs extra. The eye exam costs are more likely to vary from store to store as the optometrist is not directly employed by Costco.
Colorado, as many other states, has determined the age of majority to be 18 years of age or older. Individuals are treated as adults at the age of 18, with some exceptions, such as drinking alcoholic beverages (12-47-901), renting cars, and purchasing a hotel room. When an individual reaches the age of majority his or her parents are no longer liable for their child's actions.
The age at which one is considered a legal adult in the US is typically 18. What defines a legal adult is ability to legally work, participate in contracts, vote, marry, give sexual consent, and join the military. Being a legal adult under 21 does not give one the right in most states to purchase alcohol, however.