There was an article by the AA a few years ago showing the average mileage a bike rides in its lifetime. The average 125 gets to 20,000 miles. A 50cc was half that. It's not surprising with most being run on a tight budget.
It's always surprising to me how few miles some bikes do. The hornet was only doing about 300 miles a year for the three years before I brought it.
Then when I sold it it did a couple of hundred miles the first year. Then 160 the next.
Bikers seem to fall into mainly two categories. Those that ride a lot. And those that just do a few summer rides.
The amount of people on Twitter who said I can now ride my bike again as it's taxed in April for six months is always surprising to me.