.. old, bold, is how I've heard it, but i wonder if it's because boldold runs together; because opinion, "bold" is supposed to come before age, "old" in adjective order.

Its possible that the "d" in "old" ends in a soft "u" or "e" sound and that's why boldold presents oddly. English speakers don't like distinct vowel sounds that close together, even ones that don't have letters in the word indicating such. Is that the reason for the rhotal r? I can't remember. The comma between "bold, old" and "no, on your left" feels like a longer partial stop than the one in "old, bold".