Well, not necessarily that, but the units from other states like GA, SC, AL, MS, and etc that were arriving in Virginia in 1861 and entering service were Confederate organizations from the beginning, as opposed to being militia or state troop regiments that already existed there before being adopted into the Confederate army. Also, there were around 50 VA regiments in the state by the end of 1861.
As to what you said about the advanced age and travel and such, the North had quite a few men of advanced age in high positions. Like General John Wool, fought in War of 1812, Mexican American war, born 1784. He was 77 years old in 1861 when the war began, was in command at Fort Monroe of the Department of Virginia, wasin command and captured Norfolk, which Lincoln promotedhim to Major General in the Regular Army on the spot. He remained on active duty until age 79, in 1863, and only then because Lincoln insisted. Held slot of other important commands, and his age never seemed to affect him..another is George Cadwalader, another general from Mexican American War, not quite as old as Wool.