CREATE TABLE table_name_43 (age_on_leaving VARCHAR, political_party VARCHAR, left_house VARCHAR)

How old was the conservative party member that left the house in 2001?
SELECT age_on_leaving FROM table_name_43 WHERE political_party = "conservative" AND left_house = "2001"
SELECT "age_on_leaving" FROM "table_name_43" WHERE "2001" = "left_house" AND "conservative" = "political_party"