The average age for getting married in east China's city of Nanjing reached 31.6 last year, according to statistics from the National Population Census.
The figure has remained above 30 for the past three years, experts say.
In comparison, the average age increased from 22.85 to 24.85 between 1991 and 2010.
Shanghai male residents delay getting married to 30.11 on average, whilst females do so till 28.14, the local civil affairs department reported.
Continued unbalanced sex ratio
The sex ratio in the country was indicated as 134 men to every 100 women in 2010, compared with "normal" figures defined as anywhere between 103 to 107.
The one-percent national sample census in 2015 showed that the gender gap was more alarming in provinces such as Hainai Province, south China (165.79), compared with Zhejiang Province, east China (163.17), Shanxi Province, north China (156.08), Fujian Province, southeast China (154.84) and Qinghai Province, northwest China (155.26).
Furthermore, the population report in 2010 indicated that the older a person is, the harder it is for him or her to find a potential spouse.
For example, the gender gap between single men and women aged 20-24 was 120.77:100, whilst the proportion was 239:100 for those aged 30-34.
And for those singles aged 50 to 64, the population of males was 10-fold that of females.
The report also mentioned the notable gender imbalance in rural China, of up to 149.46, compared with 120.38 among urban youth and 130.09 among those living in towns.
Larger education gap
The 2010 population census indicated that females aged from 15 to 19 who have bachelor's or vocational degrees outnumber their counterparts.
In addition, there were far more Chinese women who had master's degrees than men, according to the report.
Higher divorce risk
Officials said the divorce rate rose from 2007-2016, contributing to more single people in the country.
Last year, 0.3 percent of couples ended their marriage.
Furthermore, the number of marriages saw negative growth in the past three years.
(Source: bjnews.com/Translated and edited by Women of China)
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