I've been trying to remember when my first eagle was since this thread started. I still can't remember which one was my first.
A) 480 yard par 5, slightly downhill drive that catches a second downhill slop around 240 off the tee, with a ravine short of the green. I hit a decent drive that was kind of popped up but carried far enough to get a good bounce, then a 4 iron to the left fringe, chipped it in.
B) 340 yard par 4, VERY downhill. Hit a drive toward the green that stopped next to a greenside bunker, then a lob shot over the bunker that rolled in.
These were both when I was 17/18, haven't had any others.