He had it by then. He got his American docs at age 16.
But I do feel that the optics are bad for a president not being legally, provably American until age 16. My dad wasn’t much older when he was naturalized. That is a long time. Not as long as our current Pres, who was in his 40s when the US Senate conferred a passport upon him.
I guess actually BEING American is overrated for candidates.