Yes, Wayne, it's true.
Well, I was 54 long ago, and just once, back in 1965, I managed to ride over 400 miles in one day. I have generally ridden 5000 to 10000 miles per year since then, sometimes in dire weather because I lived most of those years in Canada.
Undaunted, I bought a new DL650 in March 2006 and planned to ride it from Toronto Ontario to Vancouver British Columbia in early June. I actually planned to cover 400 miles per day for eight days, if I could.
So on June 4 at noon, I set out with over 100 pounds of gear in about six satchels and boxes sloppily tied behind me. Ninety miles later I made my first stop, and it felt as if I had just gone around the block. I was amazed. That day I was still amazed in Michigan, Indiana, and Illinois. Yup, I passed Chicago before midnight, and I was not in any distress. I set up my tent at a rest area beside I-80, quite impressed with the 567 miles on the trip meter for the day.
This tale is told in more detail elsewhere on this site, so I won't repeat much more. My mileage for the following days was 567, 566, 568, 495, and 490, and there I was in Vancouver, having detoured to Golden Colorado to see its roundabouts. Six days sufficed for the westward journey, with generally favorable weather but occasional rain. The return trip to Toronto was mostly through Canada, and I needed only 5 days for that, covering 687 miles on the third day. Bear in mind that, because of time changes, three of those five days were only 23 hours long.
Bottom line, a reasonably healthy 64-year-old can go 3250 miles in six days, then a week later 3050 miles in five days. This year I plan a summer trip from Toronto to Sydney NS and perhaps Newfoundland, then an October trip from Sarasota FL to Williamsburg VA.
Maintenance during the trip: Squirt the chain daily with sticky stinky goo from the local Harley shop. Change oil in Vancouver. Buy gas when the bike asks for it. Check the oil daily but never add any. Rap the tires occasionally but they never change. I guess I got 40 mpg, but I never computed it because I wasn't making decisions based on gas mileage. I generally cruised at 70-75 indicated on expressways and 50-65 on secondary roads, which I used for about a quarter of the trip. On I-76 in Colorado, a crotch rocket went past me at about mach 2. I screwed it on to see what the dickens it was and how fast it was going. In seconds, I was doing 110 and the crotch rocket was rapidly getting smaller, so I shut off and resumed 70, and never got any answers.
Go for it! Next year you will NOT be 53.