The term man (from Proto-Germanic *mann- "person") and words derived from it can designate any or even all of the human race regardless of their sex or age. In traditional usage, man (without an article) itself refers to the species or to humanity (mankind) as a whole.
The Germanic word developed into Old English mann. In Old English, the word still primarily meant "person" or "human," and was used for men, women, and children alike.[1][2] The sense "adult male" was very rare, at least in the written language. That meaning is not recorded at all until about the year 1000, over a hundred years after the writings of Alfred the Great and perhaps nearly three centuries after Beowulf.[3] Male and female gender qualifiers were used with mann in compound words.
Adopting the term for humans in general to refer to men is a common development of Romance and Germanic languages, but is not found in most other European languages (Slavic čelověkъ vs. mǫžь, Greek ἄνθρωπος vs. άνδρας, Finnish ihminen vs. mies etc.).