There are many hostels all over the continent, each with its own character.
You'll get lots of information and support from hostelers and the staff, and usually access to a kitchen to cook your own meals. You can be any age and many hostels have private doubles, twins, triples etc - some even ensuite!
PS In Patagonia don't miss the Perito Moreno Glacier - the boat goes dramtically close to the edge which is crumbling into the lake.

Two big booking agencies are hostelworld.com and hostelbookers.com and tripadvisor lists lots of hostels too.

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