I currently have an ipad air 1 with iOS10. Im not sure its slow because of its age or is it because I compare it to my iphone 6s. Im planning to get an ipad pro 12.9 for school and Im wondering how long will it last before it becomes really slow? Hoping it will last for 4 years until graduation since this will be my main computing device. Do you stop updating your device after some time or do you update until its not supported anymore? How would you know when to stop updating the OS and just stick to that iOS number? Does the 4gb of RAM help its longevity compared to the 9.7 ipp?