Which is correct; ‘a 63-year-old male‘ or a ’63-year-old man‘?
According to the AMA Manual of Style, male should not be used as a noun when referring to humans. Male and female adults (age 18 and over) should be referred to as men and women, respectively. Male and female are appropriate for use as adjectives, and as nouns when referring to animals.
The correct answer is, therefore, ‘a 63-year-old man‘.
Note that native English speaking physicians do commonly refer to men and women as males and females, especially in daily conversation. When submitting a manuscript for publication, in particular to a top-level journal, however, make sure to use the correct terminology to refer to persons’ age and sex.