SELECT T1.age FROM Person AS T1 JOIN PersonFriend AS T2 ON T1.name  =  T2.friend WHERE T2.name =  'Zach' AND T2.year  =  (SELECT max(YEAR) FROM PersonFriend WHERE name =  'Zach')
What is the age of the friend of Zach with longest year relationship?
SELECT T1.age FROM Person AS T1 JOIN PersonFriend AS T2 ON T1.name = T2.friend WHERE T2.name = 'Zach ' AND T2.year = ( SELECT max ( YEAR ) FROM PersonFriend WHERE name = 'Zach ' )
select t1 . age from person as t1 join personfriend as t2 on t1 . name = t2 . friend where t2 . name = value and t2 . year = ( select max ( year ) from personfriend where name = value )
What is the age of the friend of Zach with longest year relationship ?