At least for a few more years, based on the confirmation from the "big boss".
Secretary of Defense Ash Carter this week confirmed what had been rumored for months: The Air Force's ground attack jet, the inelegant but well-armed and well-armored A-10 Thunderbolt, nicknamed the "Warthog," will not face retirement until at least at least six years.
http://www.cnn.com/2016/02/04/politics/air-force-to-keep-a-10-flying/