I would have never have guessed.  Perhaps it’s only true in Australia:

Some rural sex workers, male and female, are aged over 70, a new study has found.

The study by the University of New England, believed to be the first of its kind in the world, interviewed 20 NSW rural sex workers.

It found the numbers of female and male sex workers in the state’s country areas had risen in the past 10 years.

While there had always been brothels in country areas, escort services had only taken off since the early 1990s, project leader Dr John Scott said.

And male escorts had only begun to appear in rural centres in the past five years, he said.

The study also found country sex workers were more educated and much older than those in the city.

The interviewees were mostly aged between 20 and 58, but there were a few – male and female – over 70, he said.