To provide additional context, and particularly that of growth trends among different sub-groups, this review also explores mCPR of young unmarried women by age, as well as sexual activity. The age of marriage varies significantly by country, as well as the size of the population engaging in non-marital sexual activity. Both factors will influence opportunities for mCPR growth by age group. This disaggregation can be used to better inform and prioritize family planning programming. Both factors will influence opportunities for mCPR growth by age group. This disaggregation can be used to better inform and prioritize family planning programming.