If he's been riding since he was 16, that would be an average of over 53K miles per year for 47 years.
Well, I've seen guys do 100,000+ in a year when they didn't do much of anything else, so I suppose its possible. And as a former politician, most folks would suspect that he wasn't doing very much, so maybe he's had the time for this for 47 straight years.
Frankly, those of us who did not keep track may just be better at math and extrapolation.
But then again, if you break it down by the day rate, its just shy of 150 miles a day for only 17,155 days straight. You don't get this kind of mileage by riding to your speeches.
The BMW Motorcycle Owners Club has an annual contest and an accumulated miles list. In the history of the Clubs 36 pages of records, there are maybe 10 who have broken 1M miles, and only maybe 3 that have reached 1.25M.
You can interpret this however you want, but the likelihood of a 63 year old guy who has had an active job for most of his life reaching double the highest levels recorded in the BMW MOC must fall somewhere between zero and epsilon.