The swing and a miss is in the bolded part of your post. Here, I'll make it a all caps for you: RULE CHANGES DO NOT MAKE PEOPLE AGE SLOWER.
Here, in case you're as bad at Googling as you are at understanding the point:
http://www.faqs.org/sports-science/A-Ba-and-timeline/Aging-and-Athletic-Performance.html#b
From the second sentence of the article: "The physical peak for most humans, in most sports, is between 25 and 35 years of age; during this peak period, the well-conditioned athlete can create a confluence of muscular strength, peak cardiovascular and oxygen transport, speed and reaction time, and mental capabilities (including the ability to deal with competitive pressures), all bound together by a desire to succeed."
The last paragraph:
"In addition to the generalized impact that age presents on injury and the body's ability to recover,
age is a significant reducing factor in the assessment of reaction time in athletes. "Reaction time" is the expression used to describe a complex sequence of related actions when the body is called upon to respond to a stimulus. Every competitive sport involves a reaction time; examples include the cricket batsman deciding whether to swing at a particular ball, an ice hockey goalie moving to stop a shot, or a sprinter exploding from the starters' block. The speed with which the athlete reacts is a combination of their ability to recognize the required response, the choices available to them, the type of reaction required, practice in responding to this situation, fatigue, and the age of the athlete."
The "in touch and correct" crowd has more if you need it.