I won't upgrade my father's iPhone for instance. He just can differentiate when a text is a text from when a text is actually a button.
All this hiper-simplified icons with no real meaningful message makes no sense to him e ther. He got lost when he tried to use my IOS7 iPad.
There are words underneath the icons though. Like no offense, but, i'm sure he can read. My 80 year-old grandmother is loving iOS on her iPhone 4s, she likes the icons better than ios 6 lol. It does take a little getting used to but once I saw all the new features I was and still am SOLD!!!!!!