No clue. He had to have started really early if by his own recollection he was 14 or 15 years old on his visit to CR. Some timelines say that alone was 2 years before the visit so 12 or 13.
I also thought Oberyn was probably older when he decided to become a maester that happened after the proposals.
Agree on Baelor. He would have been a good match for many a lady.
Yeah, I've never been able to figure on the maester thing. Maester Aemon was already training by the time Dunk & Egg starts, and he was just a kid. But Sam was considerably older, so it's hard to pinpoint when exactly Oberyn would have gone, since it's probably the difference of them planning on him being a maester and "ok, no one wants to marry you, so we're sending you to the Citadel."
But even if he hadnt gone yet and Obara wasn't born... Let's face it, he probably wasn't the paragon of chastity and virtue beforehand.
Because who wouldn't want to marry Oberyn?????
No, ok, seriously: I do think it was a pretty stupid idea. No way in hell Tywin would accept it. I agree with the Jaime/Elia match being a good one, though. Plus, look how much death and war it would prevent from happening. Ohh, if only...
That was pretty much my first thought reading the title.