Jotaro should be proud of him, he manages to bite back his first instinct of just the largest number he can think of. Joseph puts some actual thought into it, mumbling aloud as he does.
"Well, let's see... I was born in 1920, I was going to turn 19 soon when I ended up here. So the earliest your father could have been born is probably 1939... And more than likely you were born around 1960... Well, maybe a little later so let's say you're around 55? Assuming there was no more time-traveling involved."
He's busy enough with this train of thought that while he sees the Crustle moving, he hasn't actually clocked what it's up to. He's too focused on watching Jotaro for a reaction, and trying to quell the jealous outrage of Rush trying to crawl into Jotaro's arms for attention.
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"Well, let's see... I was born in 1920, I was going to turn 19 soon when I ended up here. So the earliest your father could have been born is probably 1939... And more than likely you were born around 1960... Well, maybe a little later so let's say you're around 55? Assuming there was no more time-traveling involved."
He's busy enough with this train of thought that while he sees the Crustle moving, he hasn't actually clocked what it's up to. He's too focused on watching Jotaro for a reaction, and trying to quell the jealous outrage of Rush trying to crawl into Jotaro's arms for attention.