Single O's Son *Spoiler*
So Single-0 is about 40-years of age basing that upon the actor who played him.
At the finale of the film he is reunited with his son who was supposed to be a youngster when Single-0 was killed in 1930.
Its now the year 1980,so 50-years have passed.
How come his son looks like an 80-year old man?