Actually, I'll be unmarking your words as I don't agree with them. Ronald Reagan didn't have a lightening fast speech syntax and look how effective he was.
I'll take this opportunity to post birthdates with approximate ages for thread information since you are concerned with age and appearances.
McCain born 8/29/36 current age approximately 71
Giuliani born 5/28/44 current age approximately 63
Romney born 3/12/47 current age approximately 60
Fred Thompson born 8/19/42 current age approx. 65
Ronald Reagan born 2/6/11 age at first election: 69
IOW, negligible differences, except perhaps for McCain.
Fred will be effective at debates as well as TV spots. Consider how he reduced MoonBat Moore to stunned silence with a well placed 20 second spot.
Fred Thompson born 8/19/42 current age approx. 65
That's mindblowing. Romney looks 10-15 years younger than Thompson.