Yes, generally: Old English had grammatical gender (nouns, adjectives inflected for gender), so the omission was unnoticeable. [url=http://www.crossmyt.com/hc/linghebr/austheir.html#X1x] HERE'S[/url] some comment:
It's probably worth mentioning that one reason the use of 'they' to refer to words such as 'anybody' and 'everybody' has widespread acceptance is that such words are grammatically singular but semantically plural.