What advice do you have for someone about to begin graduate studies after 10 years of being out of school?

This not my experience; however, I’d suggest that giving yourself time to adjust to new schedule, new people and the demands of a graduate program would be highly important.  Also, remember that everyone around you is making an adjustment no matter how long you’ve been out of school. 

BTW: there are some really great responses to this on the GGW Instagram page.