The information contained in this report was obtained from the U. S. Census Bureau's Annual County and Puerto Rico Municipio Resident Population Estimate by Selected Age Groups and Sex: April 1, 2020 to July 1, 2022. However, the percentages in each age group are from calculations by the County Information Program, Texas Association of Counties. For more information, contact the CIP at (512) 478-8753.
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| Data for the Gaines County Population Pyramid, All Ethnicities, as of July 1, 2022 | ||||
| Age Group | Number Male | Percent Male | Number Female | Percent Female |
| Age 85 and Older | 85 | 0.38% | 159 | 0.72% |
| Age 80-84 | 76 | 0.34% | 123 | 0.55% |
| Age 75-79 | 158 | 0.71% | 164 | 0.74% |
| Age 70-74 | 240 | 1.08% | 258 | 1.16% |
| Age 65-69 | 383 | 1.73% | 363 | 1.64% |
| Age 60-64 | 536 | 2.42% | 487 | 2.20% |
| Age 55-59 | 568 | 2.56% | 524 | 2.36% |
| Age 50-54 | 536 | 2.42% | 465 | 2.10% |
| Age 45-49 | 623 | 2.81% | 555 | 2.50% |
| Age 40-44 | 707 | 3.19% | 647 | 2.92% |
| Age 35-39 | 780 | 3.52% | 679 | 3.06% |
| Age 30-34 | 737 | 3.32% | 659 | 2.97% |
| Age 25-29 | 741 | 3.34% | 703 | 3.17% |
| Age 20-24 | 787 | 3.55% | 766 | 3.45% |
| Age 15-19 | 1,002 | 4.52% | 1,027 | 4.63% |
| Age 10-14 | 1,098 | 4.95% | 1,129 | 5.09% |
| Age 5-9 | 1,135 | 5.12% | 1,045 | 4.71% |
| Age 0-4 | 1,162 | 5.24% | 1,074 | 4.84% |
| Total, All Ethnicities | 11,354 | 51.19% | 10,827 | 48.81% |