Apple kicked off a new trade-in program that lets iPad owners turn in their older tablet models for credit that will count towards a new iOS device purchase, The Next Web reports. The offer is good for old devices, including iPad 2, iPad 3, iPad 4 and first-gen iPad mini, which can all be traded in, while the current-generation iPad Air and iPad mini with Retina display won’t be accepted by Apple retail store employees. The iPad trade-in program is available in UK, France, Germany and Spain, with users having to go to a local Apple store to trade in their devices. The trade-in value for older iPads will vary depending on tablet age and condition, and will be determined by