In the England of my youth and young adulthood it was common to refer to one's father, or school head-master, or boss as "The Old Man".
(I am told that this was frequently used in former days the U.S.A. , but that it is now all but obsolete on these shores).
"The Old Man".
My good nephew Daniel Povey told me that he, his fiancé, and his brother Mike would spend some time with "The Old Man" today to celebrate "the old man's" birthday.
It made me giggle to realize that Dan was referring to his father, my brother Andy who is six years younger than I!
Maybe I am "The Older Man".