Our iOS apps industry is so old that I have trouble remembering when it all started - so I made this handy timeline / calendar. Feel free to download an editable copy & insert your own apps release dates etc as you look fondly back to distant 2007. The numbers under the year are estimates of all iOS devices sold by years end, but I didn't find particularly good sources. Other data mostly found in Wikipedia, please comments if you have corrections and I will update the chart. Thanks!