younger — being in the first or early stage of life or growth; youthful; not old: a young woman.
youngest — being in the first or early stage of life or growth; youthful; not old: a young woman.
noun elder
junior — younger (designating the younger of two men bearing the same full name, as a son named after his father; often written as Jr. or jr. following the name): May I speak with the junior Mr. Hansen? Mr. Edward Andrew Hansen, Jr. Compare senior (def 1).
minor — lesser, as in size, extent, or importance, or being or noting the lesser of two: a minor share.
