Hello guys. Iphone 4 with Ios 7 here . I want to do a little upgrade and i am thinking buying an iphone 5S. I am just wondering how much it will last ? My girlfriend has an Iphone 5c with ios 9 and from what I saw the performance is very good IMO. My iphone 4 moves like crap with ios 7 installed and I am just wondering how many years can the 5s last until it will moves like an old man ? Also I saw the SE ( i ****** love it !) but it's to expensive for what i want (i am not a phone enthusiast) .Iphone 6 has the same performance as the 5s maybe with 15% better but how long an iPhone can last? Any Iphone 5s users here ? Are you still happy with your 5s ? Thanks !