According to GSS 2018 dataset, the average age of respondents when first married is 22.15 years old with a standard deviation of 4.885. This means that on average people are 4.885 years younger or older than 22.15 years old when first married. The median reported as 21 means the age of 21 is the middle number among all responses. The mode is 21, which means most American people first got married at the age of 21. The skewness is 2.104, far away from 0, meaning the distribution is positively skewed. The range is reported as 78: some people first got married as early as when they were 21, while some got married when they are 90 years old.