cause changes as well, but to a lesser degree. Eventually the charts began to be produced with update aeronautical information over the order base information. The current charts have one date for the base information and one date for the Aeronautical Information, commonly referred to as the Aeronautical Currency Date of the chart. The aeronautical currency dates of most charts are significantly later that the base information dates. Due to a prioritization of resources these updates to the NAV/PLAN charts became less frequent thus resulting in the aging problem with the charts. The graph depicts the age of the NAV/PLAN charts. The average age of the 6166 charts is over fifteen years old