user: Question: What is the lowest age of an astronaut named Stu Roosa?
Columns: ['Name', 'Born', 'Age on mission', 'Mission', 'Mission dates', 'Service']
Types: ['text', 'text', 'real', 'text', 'text', 'text']
Sample row: ['Frank Borman', 'March 14, 1928 (age85)', 40.0, 'Apollo 8', 'December 21–27, 1968', 'Air Force']
SQL:

assistant: SELECT MIN("Age on mission") FROM "Table" WHERE "Name" = 'Stu Roosa';