My girl's dad is like this: 60-something living in the DR with a girlfriend in her mid-20's that he actually knocked up.
Their kid is about 2 or 3, but he's younger than our oldest son (9), so whenever the subject comes up, my son & I sing the "Baby Uncle" song I made up.
Every so often, he'll hit my girl up for parenting advice, like timelines for breast-feeding and concerns about behavior....shyt's actually kind of sad BUT it's also kind of a relief because the bar is in HELL and he never visits, so I can only imagine what our first meeting would be like.
I'm DEFINITELY asking "how's the baby?" within the first 5 minutes; I can't resist. Might write a tight 5 of straight JOKES.