I'm a Mac user, I have a MacBook from late 2008... and you can tell that it's been with me for a while.... and if it doesn't crash or anything else bad happens to it, it will stay with me for at least 2 more years... and at the moment it needs more RAM and a new battery... going to order that sometime later this year.
And if you wonder, no, I don't have an iPhone... I don't even have a smartphone!