24.19% of the population of Sawahlunto/Sijunjung Regency in 2024 is aged 0-14 years.

The majority of the population in this region, or approximately 64.59%, are of working age (15-59 years), totaling 158,850. According to a 2024 publication by the Central Bureau of Statistics (BPS), the number reached 158,850. The remaining population consists of those aged 0-14 years (children), approximately 24.19%, and 11.22% are in the elderly group aged over 60 years.

The population of Sawahlunto/Sijunjung Regency as recorded in 2024 was 245,940. The population has been steadily increasing over the past 12 years. Compared to the previous five years, the Compound Annual Growth Rate (CAGR) for this region is lower. The growth rate over the last five years was recorded at 1.02%.

Compared to other districts/cities in West Sumatra Province, the population of Sawahlunto/Sijunjung Regency ranks tenth. When viewed by island, this district/city ranks 88th.

The following is the population by age in Sawahlunto/Sijunjung Regency as of June 2024, sourced from a publication by the Central Bureau of Statistics (BPS):

* Age 0-4 years: 14,750 (6%)
* Age 5-9 years: 21,740 (8.84%)
* Age 10-14 years: 23,010 (9.36%)
* Age 15-19 years: 23,640 (9.61%)
* Age 20-24 years: 22,600 (9.19%)

* Age 25-29 years: 19,190 (7.8%)
* Age 30-34 years: 15,820 (6.43%)
* Age 35-39 years: 17,160 (6.98%)
* Age 40-44 years: 18,080 (7.35%)
* Age 45-49 years: 16,610 (6.76%)
* Age 50-54 years: 14,570 (5.93%)
* Age 55-59 years: 11,170 (4.54%)
* Age 60-64 years: 9,310 (3.79%)
* Age 65-69 years: 7,990 (3.25%)
* Age 70-74 years: 5,220 (2.12%)
* Age 75 years and over: 5,060 (2.06%)