Fatigue and a thickening caseload are testing Supreme Court Justice Sonia Sotomayor’s reserve. On stage during a Monday appearance at the University of California, Berkeley’s law school, the first Latina justice spoke to the demands of the gig’s demands at her age since she was appointed by former President Barack Obama in 2009. “And to be almost 70 years old, this isn’t what I expected,” Sotomayor told UC Berkeley Law Dean Erwin Chemerinsky, according to Bloomberg Law. “But it is still work that is all-consuming, and I understand the impact the court has on people and on the country, and some…