What are the names and ages of every person who is a friend of both Dan and Alice?
SELECT T1.name ,  T1.age FROM Person AS T1 JOIN PersonFriend AS T2 ON T1.name  =  T2.name WHERE T2.friend  =  'Dan' INTERSECT SELECT T1.name ,   T1.age FROM Person AS T1 JOIN PersonFriend AS T2 ON T1.name  =  T2.name WHERE T2.friend  =  'Alice'
Hem Dan hem de Alice'in arkadaşı olan herkesin isimleri ve yaşları nelerdir?