Select and how to read the api

I'm trying to understand how to use the select, especially how to make
an option selected. I want to add the values manually, but be sure one
value is selected when finding an existing post in the db.

How are you supposed to understand how to do that from this?

http://api.rubyonrails.org/classes/ActionView/Helpers/FormOptionsHelper.html#M000940

This is what I've used until now:

<%= select 'user', 'age',
['','10-20','20-30','30-40','40-50','50-60','60-70','70+']  %>
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