I have a 2012 i7 Thinkpad T530, that is still useful. My whole life desktop machines are usually useful for about a decade. Cheap laptops don't seem to last more than 4-5 years at most, but the top end laptops built really well can last a long time. It's nice to hand useful technology down to family members also.
Low power sleep states seem to have been broken for many years in most laptops. Apple machines do not have this issue it appears.