Are you serious or just an Android user?
iPhone 4 was introduced June 24, 2010. Hardware has evolved A LOT in over 5 years. So did the software. The software takes advantage of the hardware, if this is not capable, you can't use the software... See where I'm going with this?
Yes and No , I just have an iPhone 4 that is about 3 years old and serves my needs completely fine. I don't feel the need to update just so I can be trendy and have the latest 'must have' device and don't want to be carrying a device the size of a small blackboard around in my pocket. Alll previous updates have applied to it but can I now expect that future ones will not ?