State Supreme Courts
Keith Blackwell** (born 1975) – Associate Justice, Supreme Court of Georgia[12]
Charles Canady** (born 1954) – Associate Justice, Supreme Court of Florida[12]
Britt Grant*** (born 1978)[25] – Associate Justice,
Supreme Court of Georgia (nominated to the Eleventh Circuit)
Thomas Rex Lee* (born 1964) – Associate Justice, Utah Supreme Court[11] (possible candidate for a Circuit Court vacancy[22])
Edward Mansfield** (born 1957) – Associate Justice, Iowa Supreme Court[12]
Patrick Wyrick*** (born 1981)[25] – Associate Justice, Supreme Court of Oklahoma (nominated to the Western District of Oklahoma)
Robert Young Jr.** (born 1951) – Former Chief Justice, Michigan Supreme Court[12]
(make it the youngest :-)
United States Courts of Appeals
Court of Appeals for the D.C. Circuit Brett Kavanaugh*** (born 1965)[22][24][25]
Court of Appeals for the 3rd Circuit Thomas Hardiman* (born 1965)[11][24][26]
Court of Appeals for the 5th Circuit Don Willett* (born 1966)[11] (appointed by Trump)[note 2]
Court of Appeals for the 6th Circuit Raymond Kethledge* (born 1966)[11][24][26]
Joan Larsen* (born 1968)[11] (appointed by Trump)[note 3]
Amul Thapar** (born 1969)[12][24] (elevated by Trump)[note 4]
Court of Appeals for the 7th Circuit
Amy Coney Barrett*** (born 1972)[25] (appointed by Trump)[note 5]
Diane Sykes* (born 1957)[11]
Court of Appeals for the 8th Circuit
Steven Colloton* (born 1963)[11]
Raymond Gruender* (born 1963)[11]
David Stras* (born 1974)[11] (appointed by Trump)[note 6]
Court of Appeals for the 10th Circuit
Allison Eid* (born 1965)[11] (appointed by Trump)[note 7]
Neil Gorsuch** (born 1967)[12][13] (nominated and confirmed)
Timothy Tymkovich** (born 1956)[12]
Court of Appeals for the 11th Circuit
Kevin Newsom*** (born 1972)[25] (appointed by Trump)[note 8]
Bill Pryor* (born 1962)[11]
Court of Appeals for the Armed Forces
Meg Ryan** (born 1964)[12]
I’d pass over those born in the 1950s. Not that they wouldn’t be excellent choices, just that a very long tenure on the Supreme Court. Someone in their mid-40s to mid 50s would be a good age range.