Aging modifiers for children/adolescents?

[Cheiromancer]

PCs and NPCs who have not yet reached maturity- what bonuses or penalties do they get to their ability scores?

I could have sworn I saw some rules on this, but it may have been a prior edition, or over in house rules.

 

[Ankh-Morpork Guard]

I don't have it on hand at the moment, but I(and others) use the d20 Modern rules for Children. I think that may be in the d20 Modern SRD.

 

[Creamsteak]

Found it,

Children
Children (newborns to age 11) are handled differently from other characters. They do not have classes or levels. They begin with the same ability score package as ordinaries (15, 14, 13, 12, 10, 8), but their ability scores are reduced as follows: –3 Str, –1 Dex, –3 Con, –1 Int, –1 Wis, –1 Cha.
Children have 1d4 hit points plus their Constitution modifier (minimum 1 hit point). They have no skills, feats, action points, or occupations. Their base attack bonus is +0, they have a +0 modifier on all saving throws (plus any modifiers for high or low ability scores), and their Reputation bonus is +0. Children have a +0 modifier to Defense and a normal speed of 20 feet. Children have no effective attacks and should be treated as noncombatants.
When a child turns 12, he or she is considered a young adult and takes his or her first level in one of the six basic classes. At that point, the character becomes an ordinary (or hero, in some cases).

 

[Cheiromancer]

Thank-you!

I'm surprised, though, that 12 is when a character takes a normal class and takes standard modifiers. The minimum age for a human starting character in the PHB is 16. (page 109).

But I guess one could interpolate between the values for an 11 year old, and the values for an adult. Assuming mental development lags behind physical, a -1 to Int, Wis and Cha would be fair, I think.

Anybody still have their 2nd edition books (or even 1st edition)? I've checked Hackmaster and can't find anything on aging modifiers for children or adolescents.