Stories about solo travel have been published for years. I just saw the following from 2000 in Time magazine. Only part of the story is available but writers were talking about solo travel over 12 years ago.
Travel: Going Solo
The yearning to see faraway places and the fear of visiting them alone seem to be universal human traits. Whenever travel writer Arthur Frommer gives a lecture and opens the floor to questions, a woman inevitably raises her hand and asks whether a female can safely travel by herself. "I always notice that all the men are leaning forward to catch the answer too," says Frommer. His verdict, for all concerned: an emphatic Yes!
Once fear is conquered, many older adults find they actually prefer traveling solo. Mature Americans, 55 and older, stay away from home the longest, according to... Read more: http://www.time.com/time/magazine/article/0,9171,998332,00.html#ixzz2bgIi8DZN
Now there are hundreds of articles each month sharing solo adventures, men and women traveling to countries that are often remote and possible considered dangerous by the average traveler. All solo travelers approach the travel experience differently.
Most writers think solo travel is only for gap years, for 20 somtthings or for those who don't want a REAL job.
Fewer articles are written about solo travelers who don't fit these categories.