Going to back to grad school in your 30's?

I'm 29, and have been living abroad and working, but I'd really like to go back to graduate school and ultimately become a history professor. I took the GRE in 2002, after I graduated and did fine on them, but they are no longer valid.
In case you or someone you know have gone back to school after a long break, how was the transition back to research/the classroom?

If you have a family, is it possible to make ends meet, or is my wife going to have to bring home the bacon?
 
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