The population of Hong Kong increased at an average annual growth rate of 0.8 percent in the past three decades from 5.75 million in 1991 to 7.41 million in 2021. 

The numbers also showed a continuing aging trend, as the median age of citizens jumped from 31.6 to 46.3 in 30 years. 

However, there was an obvious declining trend in the city's fertility, with the rate dropping from 1,281 live births per 1,000 woman in 1991 to 772 in 2021. 

The median age at first marriage was 32.2 for bridegrooms and 30.6 for brides in 2021, marking an increase of 3.1 and 4.4 respectively comparing with the figures logged in 1991. The number of divorce decrees granted increased significantly from 6,295 in 1991 to 16,692 in 2021. 

Meanwhile, both men and women get to live longer with their life expectations extended by 8 years to 83.2, and by 7.2 years to 87.9, respectively, as of 2021.