An 81-year-old northern Iowa man has been sentenced to 50 years in prison for sexually abusing two 8-year-old girls. Clarence Miller, of Thompson, received 25 years on each count of second-degree sexual abuse. Miller must serve at least 35 years before he is eligible for parole. A jury convicted Miller in September of two counts of sexual abuse involving the girls. Prosecutors say Miller assaulted the girls at his home between January 2010 and August 2012.