Mamoru Oshii is 60 years old (birthdate: August 8, 1951).
Yasuhito Endo is 31 years old (birthdate: January 28, 1980).
Mamoru Miyano is 28 years old (birthdate: June 8, 1983).
69
There is no clear answer, some youngins are old and some oldins are young. Another opinion: At least 80. On the lighter side. This answer was kindly dedicated to Lazarus