{"chart":{"title":"Average age of mothers at childbirth by mother's birth year","subtitle":"Each line shows the average age at which women, born in a specific year, had their first child, second child, third child, or more.","note":"To allow for comparisons between countries and over time, this metric is [age-standardized](#dod:age_standardized).","xAxisLabel":"Women's birth year","citation":"Human Fertility Database (2024)","originalChartUrl":"https://ourworldindata.org/grapher/average-age-of-mothers-birth-cohort","selection":["United States"]},"columns":{"Cohort mean ages at birth - Birth order: 1":{"titleShort":"1st birth","titleLong":"1st birth","descriptionShort":"The average age at which women in a specific birth cohort have their first child. It is standardized for the age structure of the female population of reproductive age.","descriptionKey":["Shows the average age when women in a specific group have their children.","Highlights how the timing of childbirth differs from one generation to the next.","Calculated from the actual rates at which women have children during their reproductive years."],"unit":"years","timespan":"1918-1973","type":"Numeric","owidVariableId":998683,"shortName":"cmab__birth_order_1","lastUpdated":"2024-11-19","nextUpdate":"2025-11-19","citationShort":"Human Fertility Database (2024) – processed by Our World in Data","citationLong":"Human Fertility Database (2024) – processed by Our World in Data. “1st birth – HFD” [dataset]. Human Fertility Database, “Human Fertility Database” [original data].","fullMetadata":"https://api.ourworldindata.org/v1/indicators/998683.metadata.json"},"Cohort mean ages at birth - Birth order: 2":{"titleShort":"2nd birth","titleLong":"2nd birth","descriptionShort":"The average age at which women in a specific birth cohort have their second child. It is standardized for the age structure of the female population of reproductive age.","descriptionKey":["Shows the average age when women in a specific group have their children.","Highlights how the timing of childbirth differs from one generation to the next.","Calculated from the actual rates at which women have children during their reproductive years."],"unit":"years","timespan":"1918-1973","type":"Numeric","owidVariableId":998689,"shortName":"cmab__birth_order_2","lastUpdated":"2024-11-19","nextUpdate":"2025-11-19","citationShort":"Human Fertility Database (2024) – processed by Our World in Data","citationLong":"Human Fertility Database (2024) – processed by Our World in Data. “2nd birth – HFD” [dataset]. Human Fertility Database, “Human Fertility Database” [original data].","fullMetadata":"https://api.ourworldindata.org/v1/indicators/998689.metadata.json"},"Cohort mean ages at birth - Birth order: 3":{"titleShort":"3rd birth","titleLong":"3rd birth","descriptionShort":"The average age at which women in a specific birth cohort have their third child. It is standardized for the age structure of the female population of reproductive age.","descriptionKey":["Shows the average age when women in a specific group have their children.","Highlights how the timing of childbirth differs from one generation to the next.","Calculated from the actual rates at which women have children during their reproductive years."],"unit":"years","timespan":"1918-1973","type":"Numeric","owidVariableId":998695,"shortName":"cmab__birth_order_3","lastUpdated":"2024-11-19","nextUpdate":"2025-11-19","citationShort":"Human Fertility Database (2024) – processed by Our World in Data","citationLong":"Human Fertility Database (2024) – processed by Our World in Data. “3rd birth – HFD” [dataset]. Human Fertility Database, “Human Fertility Database” [original data].","fullMetadata":"https://api.ourworldindata.org/v1/indicators/998695.metadata.json"},"Cohort mean ages at birth - Birth order: 4":{"titleShort":"4th birth","titleLong":"4th birth","descriptionShort":"The average age at which women in a specific birth cohort have their fourth child. It is standardized for the age structure of the female population of reproductive age.","descriptionKey":["Shows the average age when women in a specific group have their children.","Highlights how the timing of childbirth differs from one generation to the next.","Calculated from the actual rates at which women have children during their reproductive years."],"unit":"years","timespan":"1918-1973","type":"Numeric","owidVariableId":998701,"shortName":"cmab__birth_order_4","lastUpdated":"2024-11-19","nextUpdate":"2025-11-19","citationShort":"Human Fertility Database (2024) – processed by Our World in Data","citationLong":"Human Fertility Database (2024) – processed by Our World in Data. “4th birth – HFD” [dataset]. Human Fertility Database, “Human Fertility Database” [original data].","fullMetadata":"https://api.ourworldindata.org/v1/indicators/998701.metadata.json"},"Cohort mean ages at birth - Birth order: ≥5":{"titleShort":"5th birth or higher","titleLong":"5th birth or higher","descriptionShort":"The average age at which women in a specific birth cohort have their fifth (or greater)\n child. It is standardized for the age structure of the female population of reproductive age.","descriptionKey":["Shows the average age when women in a specific group have their children.","Highlights how the timing of childbirth differs from one generation to the next.","Calculated from the actual rates at which women have children during their reproductive years."],"unit":"years","timespan":"1918-1973","type":"Numeric","owidVariableId":998707,"shortName":"cmab__birth_order_5p","lastUpdated":"2024-11-19","nextUpdate":"2025-11-19","citationShort":"Human Fertility Database (2024) – processed by Our World in Data","citationLong":"Human Fertility Database (2024) – processed by Our World in Data. “5th birth or higher – HFD” [dataset]. Human Fertility Database, “Human Fertility Database” [original data].","fullMetadata":"https://api.ourworldindata.org/v1/indicators/998707.metadata.json"},"Cohort mean ages at birth - Total":{"titleShort":"All","titleLong":"All","descriptionShort":"The average age at which women in a specific birth cohort have children. It is standardized for the age structure of the female population of reproductive age.","descriptionKey":["Shows the average age when women in a specific group have their children.","Highlights how the timing of childbirth differs from one generation to the next.","Calculated from the actual rates at which women have children during their reproductive years."],"unit":"years","timespan":"1876-1973","type":"Numeric","owidVariableId":998713,"shortName":"cmab__birth_order_total","lastUpdated":"2024-11-19","nextUpdate":"2025-11-19","citationShort":"Human Fertility Database (2024) – processed by Our World in Data","citationLong":"Human Fertility Database (2024) – processed by Our World in Data. “All – HFD” [dataset]. Human Fertility Database, “Human Fertility Database” [original data].","fullMetadata":"https://api.ourworldindata.org/v1/indicators/998713.metadata.json"}},"dateDownloaded":"2025-07-09"}