We often think of prison as a transformative place -- young men enter its doors criminals and exit older, chastened individuals. But what happens towards the end of a longer sentence? Getty Images photographer Andrew Burton visited state prisons across the U.S. in December to document the daily lives of aging prisoners, whose numbers have increased by 500% in the last several decades. Frank Fuller, age 66, walks down the hall to his cell at California Men's Colony prison, Dec. 20, 2013.
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