DeKalb County said goodbye to a combined 120 years of experience this past week as 10 members of the county body attended their last meeting.“I’ve served a long time and the best things in this job are the people I’ve met over the years,” said long-time commissioner Larry Summers, offering a piece of advice for the 10 newcomers who will take office Sept. 1. “Be humble and take good care of our county.”Summers served on the county commission for 38 years and was the senior member of the commission. He was one of seven commissioners swept out of office during a wave of change that began during the Democratic Primary in May when five incumbents lost.