I thought of one thing, though, but I don't have the books here now to confirm, so this is based solely on what I remember.
When Harry uses the Floo to talk to Sirius and Remus about Snape's worst memories he'd just seen, doesn't Sirius say that they were fifteen when it happened? Harry says something like his father was an idiot, and Sirius answers "of course he was an idiot, we were fifteen, we were all idiots" or something like that. And then in the conversation with Dumbledore in PoA, Snape says that Sirius was sixteen when "The prank" happened. If I remember correctly.
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I thought of one thing, though, but I don't have the books here now to confirm, so this is based solely on what I remember.
When Harry uses the Floo to talk to Sirius and Remus about Snape's worst memories he'd just seen, doesn't Sirius say that they were fifteen when it happened? Harry says something like his father was an idiot, and Sirius answers "of course he was an idiot, we were fifteen, we were all idiots" or something like that. And then in the conversation with Dumbledore in PoA, Snape says that Sirius was sixteen when "The prank" happened. If I remember correctly.