Let us reason: Methuselah lived how long?: Part nine in a series
Ross, H. 1991.  Facts and Faith 5(1):4-5. CELD ID 6346

Abstract
A question you may have encountered-I certainly hear it often-has to do with the Biblical record of life spans on the order of 900+ years for many pre-flood people, including Methuselah, who is said to have lived 969 years. Most people wonder if the ancient "year" was the same as the modern year.