All OEM coolant, in spite of "lifetime" monikers need changed. In most cases though "lifetime" means until some other part's lifetime ends resulting in dumping much of your coolant; at which point you have to replace
WW will break down w/ extensive & extreme hi-temp exposure (google can help you find their MSDS and ASTM spec info).
All in all though, you're not going to find a "frequency guide" b/c too much depends on how and under what conditions you use your car... same w/ oil changes and brake bleeding/flushing. In most cases those minimally are annual and every two or three years respectively (usage dependent).
Personally, I err on side of caution and change more frequently than not. You know, I've never had a motor (or service adviser for that matter) complain about too frequent oil change. Well one time a BMW SA did but that's another story... And, in the grand scheme of things it's VERY inexpensive for the cheap insurance provided.
In short, YES needs changed periodically.
Good luck
