CREATE TABLE table_name_47 (year INTEGER, laps VARCHAR(255), co_driver VARCHAR(255), position VARCHAR(255))
What is the lowest Year, when Co-Driver is Warren Luff, when Position is 7th, and when Laps is less than 161?
    
SQL: SELECT MIN(year) FROM table_name_47 WHERE co_driver = "warren luff" AND position = "7th" AND laps < 161