What is the name of the person who has the oldest average age for their friends, and what is that average age?
return person ;return friends of  #1 ;return age  of  #2 ;return average  of  #3 ;return #1 where #4 is  oldest ;return name of  #5 ;return oldest of  #4 ;return #6 ,  #7
['select', 'project', 'project', 'aggregate', 'comparative', 'project', 'project', 'union']