Great question — answering as the UphillTech team:
There are three main, popular trekking regions in Nepal - the Anapurna circuit , the trek to the Everest Base Camp (and side trips) and the area surrounding Gosaikund , which includes the Langtang valley and Helambu . All three of these treks are very popular and quite safe; I saw people of all ages, including families and children. There's a good page on Nepal trekking on WikiVoyage . By "very popular", I mean hundreds of people traveling on each day of the trek (at least for Anapurna and Everest) - you'll rarely be alone for long! This has both advantages and disadvantages, obviously. One advantage is that even if traveling alone, you can easily meet people and "group up". How to pick a...
Full answer by Eyal: https://outdoors.stackexchange.com/a/3670 (CC BY-SA 4.0).
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