The majority of Kendal Regency's population in 2023 is of working age.

Kendal Regency's population, categorized by age group, shows 703,640 individuals (64.9%) in the productive age group, 237,920 individuals (21.95%) as children, and the remaining 13.15% or 142,590 individuals as the elderly population.

Kendal Regency's population was recorded at 1.08 million as of June 2023. This figure increased compared to December 2021 and is higher than in December 2020. Over the past five years, the Compound Annual Growth Rate (CAGR) of the population in this region was 2.25%. This growth is higher than the growth recorded in the previous five years, which was 0.64%.

Based on the total population of Central Java Province, this regency ranks 15th, while based on island ranking, it is 66th.

The following is the population by age group in Kendal Regency in June 2023, sourced from the Central Bureau of Statistics (BPS) publication:

* Age 0-4 years: 70,310 people (6.52%)
* Age 5-9 years: 81,380 people (7.55%)
* Age 10-14 years: 86,240 people (8.0%)
* Age 15-19 years: 71,570 people (6.64%)
* Age 20-24 years: 81,300 people (7.54%)
* Age 25-29 years: 82,010 people (7.61%)
* Age 30-34 years: 83,790 people (7.78%)
* Age 35-39 years: 86,470 people (8.02%)
* Age 40-44 years: 86,390 people (8.02%)
* Age 45-49 years: 76,860 people (7.13%)
* Age 50-54 years: 70,040 people (6.5%)
* Age 55-59 years: 65,220 people (6.05%)
* Age 60-64 years: 54,690 people (5.08%)
* Age 65-69 years: 39,020 people (3.62%)
* Age 70-74 years: 23,750 people (2.2%)
* Age 75 years and over: 25,130 people (2.33%)