{"entity":{"iso2":"US","iso3":"USA","name":"United States of America","slug":"united-states"},"indicator":{"licence":"CC BY 4.0 (Our World in Data)","slug":"period-average-age-of-mothers-birth-order","source":"Human Fertility Database (2025) \u2013 processed by Our World in Data","source_url":"https://ourworldindata.org/grapher/period-average-age-of-mothers-birth-order","title":"Average age of mothers at childbirth by birth order","unit":"years"},"observations":[{"date":"1933-01-01","value":23.32},{"date":"1934-01-01","value":23.3},{"date":"1935-01-01","value":23.36},{"date":"1936-01-01","value":23.49},{"date":"1937-01-01","value":23.52},{"date":"1938-01-01","value":23.61},{"date":"1939-01-01","value":23.72},{"date":"1940-01-01","value":23.88},{"date":"1941-01-01","value":23.91},{"date":"1942-01-01","value":24.0},{"date":"1943-01-01","value":23.97},{"date":"1944-01-01","value":23.96},{"date":"1945-01-01","value":24.03},{"date":"1946-01-01","value":24.2},{"date":"1947-01-01","value":23.82},{"date":"1948-01-01","value":23.49},{"date":"1949-01-01","value":23.39},{"date":"1950-01-01","value":23.27},{"date":"1951-01-01","value":23.11},{"date":"1952-01-01","value":23.09},{"date":"1953-01-01","value":22.93},{"date":"1954-01-01","value":22.81},{"date":"1955-01-01","value":22.72},{"date":"1956-01-01","value":22.55},{"date":"1957-01-01","value":22.47},{"date":"1958-01-01","value":22.43},{"date":"1959-01-01","value":22.36},{"date":"1960-01-01","value":22.32},{"date":"1961-01-01","value":22.28},{"date":"1962-01-01","value":22.24},{"date":"1963-01-01","value":22.24},{"date":"1964-01-01","value":22.38},{"date":"1965-01-01","value":22.38},{"date":"1966-01-01","value":22.39},{"date":"1967-01-01","value":22.36},{"date":"1968-01-01","value":22.51},{"date":"1969-01-01","value":22.46},{"date":"1970-01-01","value":22.43},{"date":"1971-01-01","value":22.45},{"date":"1972-01-01","value":22.42},{"date":"1973-01-01","value":22.48},{"date":"1974-01-01","value":22.66},{"date":"1975-01-01","value":22.77},{"date":"1976-01-01","value":22.96},{"date":"1977-01-01","value":23.09},{"date":"1978-01-01","value":23.25},{"date":"1979-01-01","value":23.35},{"date":"1980-01-01","value":23.44},{"date":"1981-01-01","value":23.6},{"date":"1982-01-01","value":23.71},{"date":"1983-01-01","value":23.83},{"date":"1984-01-01","value":23.96},{"date":"1985-01-01","value":24.03},{"date":"1986-01-01","value":24.12},{"date":"1987-01-01","value":24.25},{"date":"1988-01-01","value":24.31},{"date":"1989-01-01","value":24.31},{"date":"1990-01-01","value":24.33},{"date":"1991-01-01","value":24.28},{"date":"1992-01-01","value":24.35},{"date":"1993-01-01","value":24.36},{"date":"1994-01-01","value":24.4},{"date":"1995-01-01","value":24.5},{"date":"1996-01-01","value":24.66},{"date":"1997-01-01","value":24.81},{"date":"1998-01-01","value":24.91},{"date":"1999-01-01","value":25.04},{"date":"2000-01-01","value":25.2},{"date":"2001-01-01","value":25.33},{"date":"2002-01-01","value":25.49},{"date":"2003-01-01","value":25.7},{"date":"2004-01-01","value":25.73},{"date":"2005-01-01","value":25.71},{"date":"2006-01-01","value":25.65},{"date":"2007-01-01","value":25.66},{"date":"2008-01-01","value":25.73},{"date":"2009-01-01","value":25.86},{"date":"2010-01-01","value":26.06},{"date":"2011-01-01","value":26.27},{"date":"2012-01-01","value":26.41},{"date":"2013-01-01","value":26.61},{"date":"2014-01-01","value":26.84},{"date":"2015-01-01","value":26.97},{"date":"2016-01-01","value":27.15},{"date":"2017-01-01","value":27.25},{"date":"2018-01-01","value":27.37},{"date":"2019-01-01","value":27.41},{"date":"2020-01-01","value":27.51},{"date":"2021-01-01","value":27.71},{"date":"2022-01-01","value":27.79},{"date":"2023-01-01","value":27.85}],"summary":{"latest_period":"2023-01-01","latest_value":27.85,"max":27.85,"mean":24.2043,"min":22.24,"of":33,"rank":27,"trend":"rising"}}