Ask HN: How often does your company replace your laptop?

A large industrial corporation I have worked for would only replace a company laptop after 5 years unless it really stops working. It's all Windows laptop, and the laptops employees could order are mostly models from more than 1 year ago. Needless to say that productivity drops significantly after 2-3 years.

I just would like to know if this is a common practice, and how often does your company replace your laptop?