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Number of marriages: Marriage means a marriage between a man and a
woman according to the provisions of the Marriage and Family Law regarding
conditions of marriage and marriage registration. Men and women getting
married must comply with the following conditions:

a) Man is from 20 years of age or older, woman is from 18 years old or older;

b) The marriage is voluntarily decided by men and women;
c) Do not lose civil act capacity;

d) Marriage does not fall into one of the circumstances where marriage is
prohibited under the Law on Marriage and Family.

Singulate mean age at marriage (SMAM): Singulate mean age at
marriage of the population is the average number of years of single person in
their whole life, if this generation has proportion of single age as the proportion
of single person collected at the survey time point.
In order to have an overall view on the age of starting a married life of the
population, when calculating the singulate mean age at marriage, the statistical
agency not only identifies married persons who are married as stipulated by the
Law on Marriage and Family but also identifies married persons who satisfy
conditions as stipulated by the Law on Marriage and Family but have not been
certificated; those who are married but do not satisfy conditions as stipulated by
the Law on Marriage and Family; those who are child marriage; and those who
cohabit with the opposite sex.

Formula:

45

15   5 5 S  50 S 50
X
SMAM  X  15

1 S 50
Where:

SMAM: Singulate mean age at marriage.

5S X : Proportion of single age in 5-year interval of age: x -> x+5.

S 50: Proportion of single age at the age of 50 years old and S 50 is
calculated by average value of 5S 45 and 5S 50

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