I am writing a book set in the present day with a very old character (thousands of years old). A modern day human asks him:
"Do you speak Latin, like really speak Latin?"
His response would be in old fashioned Latin from when he spoke it natively and would be something like "I used it for many years" or whatever similar phrase would seem appropriate and sound best. If it makes a difference he likes/respects the person he's talking to but might be tempted to show off a bit.
I tried using Google translate but that is notoriously bad for Latin, and my own grasp of the language isn't good enough to verify the results. It suggests that "I used it for many years" translates as "Ego autem per multos annos". Or alternatively "Of course, I spoke it for many years", translates as "Scilicet ego locutus est per multos annos".
So the first part of the question is, what would be the best phrase in Latin for him to use in response? It doesn't need to be this exact phrase but something with a similar meaning.
And the second part is - if he's speaking thousand-year-old Latin, not modern day Latin but probably not old Latin either, would there be anything that an archaeology post-grad with a keen interest in history would notice as unusual about what he says or the accent he uses?