Cost is 1 point per level.
Normally a beginning character's age is determined by his skills being
divided by two (i.e., 40 points in skills equals a character 20 years
old). The problem with this is that sometimes you have a very gifted
individual that may need to exceed this limit. For example a child
prodigy may be compossing or playing masterfully by age 6. The problem
in game terms is that they must have extremely high DX or IQ to be able
to reflect talent with the current skill and age rules. My answer to
this problem is that for each level of extensive training, a character
ignores 10 character points for determining the character's age.
A character that has a total of 90 points in skills, would normally be
45 years old, but if this character has 3 levels of Extensive training
he would be 30 years old.
So it is possible to build a child prodigy that is normal in every way
except for one skill or talent where this child truely excells for his
age....a 6 year old that has a 20 skill in writing and composing music
for instance....or perhaps the child has a high level in one magical
spell or ability such as forseeing the furture....perhaps the child
can read minds....or knows about something.....
I believe that the use of the Extensive Training advantage allows for
more creative character concepts and is a useful addition for designing
characters. I have used it many times and consider it well tested. I
hope you enjoy it...