What is the location of the party with the oldest host?
SELECT T3.location FROM party_host AS T1 JOIN HOST AS T2 ON T1.Host_ID   =   T2.Host_ID JOIN party AS T3 ON T1.Party_ID   =   T3.Party_ID order by T2.age desc limit 1
oldest host refers to MAX(age); location of the party refers to party.location;