NOTE: Gray indicates insufficient data or a suppressed estimate.
The San Luis Valley and south-central Colorado consistently display the highest median ages, with numerous zip codes exceeding 55–60 years, while the Front Range urban corridor—particularly zip codes in and around Denver, Colorado Springs, and Fort Collins—skews notably younger, frequently falling below 35. Mountain resort communities in the central Rockies exhibit a mixed pattern, with some ski-town zip codes trending younger due to seasonal workforce populations and adjacent rural areas aging considerably older. The eastern plains show moderate median ages generally in the 40–50 range, with scattered pockets of older populations, contrasting sharply with the very young (sub-25) purple-shaded zip codes likely associated with military installations or university communities near Pueblo and the Denver metro area.
Data: U.S. Census Bureau, 2023 ACS
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