Mal-2: The point is that some might find the idea of 8 year olds (or 3 year olds) with stats like 14,12,12,12,8,6 to be a little bit unbelievable. Technically, under your method you could have a toddler with 16 STR.
So while a -2 penalty to all stats might work fine for a 14 years old male, its probably not going to work for the same kid at 3, 6 or 10.
S'mon: You may be right. Strength is probably the easiest stat to derive exact numbers for, but try finding good cross cultural numbers on 6 year olds bench press ability. It's also a bizarre attribute. On the bizzarre side, two creatures with the same strength score can have vastly different strength. A huge creature with a 26 strength can lift, pull, and carry alot more than a medium sized creature with a 26 strength. That's the bizarre part, so my first point would be that as small sized creatures children have 3/4 the lifting and carrying capacity of a human with the same strength score.
And arguably that 3/4 score is being overly generous with small creatures (as is the fact that they dont' have a penalty to constitution) so that small demi-humans are still attractive as PC's.
I don't claim that 6 strength is exact. The actual number I calculated using a linear model was about a 5, but I rounded to 6 because 5 seemed a little low for Int, Wis, Dex and the other stats and I didn't want to get into the complexities of modeling strength (or anytthing else) in a non-linear fashion. The truth is that human males gain a disproportionate ammount of thier strength after the onset of puberty, so that while a rather linear model may work for something like Dex it doesn't work for Str. So yes, children probably have rather low strength compared to there other stats. Exactly what it is, I couldn't tell you, but I'd be interested to know.
If you want to start getting accurate though most 12 year children are as strong as most adult women (at least those not in an atheletics program) but the last time I asserted something like that thread just blew up in a swarm of contriversy so lets not go there.
I don't see alot of point in taking into account the puberty effect when D&D doesn't even take into account sexual dimorphism so I'll stick to a linear model. We should probably just put little boys and girls on the same curve and be done with it, ignoring the fact that girls hit puberty sooner and should have a faster curve on every stat (often including strength, remember 5th grade?) and that boys and girls don't normally end up with the same strength (or strengths). After all, its only a game right.
