> all of those usages of singular they have been in use for as long as I can remember. I find none of them jarring. You're saying even in the previous century

> all of those usages of singular they have been in use for as long as I can remember. I find none of them jarring. You're saying even in the previous century you frequently heard others refer to their own child as "they"? And you didn't find it jarring one bit?