Actually I am a man; I mentioned Aya Khema only because that is one example I know of where a person my age ordained in Sri Lanka. I know it is possible, that I would be accepted in SE Asia. For me it is mostly a question of the practicality of ordaining late in life. Aya Khema returned to the west before long. It seems like most of the Bhikkus from the West either disrobe or at least return to the West eventually. I wonder that so few seem to stay, and it makes me wonder if the life there is very harsh, which begs the question: perhaps 53 is pushing it a bit.
I'm studying Singhala now, to try to increase the odds that I can integrate.