How often would you replace your laptops or other gadgets?

I would like to be able to keep up with the TECHNOLOGY but just think about it for a minute ,you would be purchaseing a lot of cell phones! my sis has had 3 just since january.Sprint comes out with a new improved model every week.. Im sorry but if it aint broke dont fix it .my laptop tablet started out with vista, changed to windows 7 Ultimate and as long as it works, i will just use it..It all depends on a lot of variables..If you can afford to do that these days ,maybe your making to much money! lol!