*giggle* Nah, if he was a Neanderthal, he'd have been bonked over the head by another Neanderthal for some cave-shakin' fun. Them Neanderthals weren't none too smart, y'know. ;)
Look at his avatar. Lots of long lustrous hair for one of them Neanderthal men to snag and drag 'im off with. (Ya hippie! And that gitar, what do you think you're in, the Charlie Daniels band? Go back to the west coast, ya tree huggin' fruitcake!)
(Just kidding, I don't know what came over me. I'm in an odd mood today. Probably due to sleep deprivation, you know? Because nothing else could make me type and sound like a redneck more than that. :)
Seriously though - there's been lots of evidence that Neanderthals had shorter life spans, simply because most of the bones they usually find are those of "young" individuals (not 100% sure on how they know this, but they thought Lucy was a young female, at least, and wasn't she found with the skeleton of a little kid?), and in the female bodies at least, they can tell that they've probably given birth a few times (based on the pelvic canal width, pubic symphesis, etc, probably. After all, I'm not an anthropologist, so I really don't know for certain. But I am a Discovery Channelist, so I know the watered down versions of it. :).
So, even if physically they matured at the same rate (which I doubt), mentally they've had the survival of themselves and others on them at a much younger age, so mentally they probably were far far far more mature than the modern day 15 year old. (heck, even the modern day 25 year old, too, I'd imagine.)
So... since my husband is a high school teacher, I have had the misfortune/fortune to interact with 15 year olds quite a bit... I'll keep my usual opinion of them. ;)