*shrug* I disagree he has never shown T judgement, nor that his judgement is clear-cut qualitative rather than quantitiative.reveals F judgment behind his choices in life, and never T judgment, then he's a clear-cut F.
Which'd make sense if he's an IN_P. We aren't going to see much of his internal judging processes. They're, you know, internal.
His mild expressiveness could be as a result of a matured inferior Fe as easily as not. He's mid-forties, it'd be just the right time for that. And last, having known a few INFPs and INTPs, he seems a lot more typical to my experience of an aging INTP than an aging INFP.
But hey, feel free to be wrong.