What is the name of the person who has the oldest average age for their friends, and what is that average age?
SELECT T2.name ,  avg(T1.age) FROM Person AS T1 JOIN PersonFriend AS T2 ON T1.name  =  T2.friend GROUP BY T2.name ORDER BY avg(T1.age) DESC LIMIT 1
Arkadaşları için en eski ortalama yaşı olan kişinin adı nedir ve bu ortalama yaş nedir?