66.34% of Serang City's population in 2024 will be aged 15-59 years.

The majority of the population in this region, or about 66.34%, are of working age (15-59 years old), totaling 493,440. According to a 2024 publication by the Central Bureau of Statistics (BPS), the number reached 493,440. The remaining population consists of those aged 0-14 years (children), approximately 26.55%, and 7.11% are in the elderly group (over 60 years old).

The population of Serang City was recorded at 743,750 as of 2024. This figure is higher than in 2023 and higher than in December 2021. Compared to five years earlier, the region's Compound Annual Growth Rate (CAGR) is higher. The growth over the last five years was recorded at 1.87%.

Compared to other districts/cities in Banten province, Serang City ranks seventh in population; while by island, this district/city ranks 93rd.

The following is the population by age in Serang City in June 2024, sourced from a publication by the Central Bureau of Statistics (BPS):

* Age 0-4 years: 53,920 (7.25%)
* Age 5-9 years: 73,660 (9.9%)
* Age 10-14 years: 69,880 (9.4%)
* Age 15-19 years: 49,980 (6.72%)
* Age 20-24 years: 64,700 (8.7%)

* Age 25-29 years: 67,960 (9.14%)
* Age 30-34 years: 65,850 (8.85%)
* Age 35-39 years: 61,890 (8.32%)
* Age 40-44 years: 56,290 (7.57%)
* Age 45-49 years: 50,670 (6.81%)
* Age 50-54 years: 42,620 (5.73%)
* Age 55-59 years: 33,470 (4.5%)
* Age 60-64 years: 22,910 (3.08%)
* Age 65-69 years: 14,220 (1.91%)
* Age 70-74 years: 8,450 (1.14%)
* Age 75 years and older: 7,280 (0.98%)