The standing vertical jump which you often refer to as a measure of an athletes inherent physical ability. Much like the IQ of a person this value cannot be significantly increased but is basically the inherent physical prowess of that individual.
However, a male being tested at the age of 18 is going to have a significantly higher standing vertical jump then he will at 68. Even a superior athlete with the vertical jump of 30+ inches at the age of 18 is going to have a horrible vertical jump value at the age of 68, yet he is the same person.
So my questions are:
At what age range are standing vertical jump numbers valid?
Are there any curves showing the degradation of the standing vertical jump with age?
What test can be used to determine the inherent athletic ability of a 68 year-old old?
Does the reaction time of an individual mean anything to inherent strength ability?