In my Cherokee, I don't really have a limit on headwinds for takeoff or landing as long as it's sustained. Taxing a low wing aircraft in strong winds isn't too bad, compared to a Cessna. I think the highest I took off or landed in was 35kt. If it's much more than that, it usually is accompanied by weather I wouldn't want to be flying in anyways. What I do pay attention to though is gusts. If the gust factor is above 10 e.g. 30G41, I will need a damn good reason to takeoff and if it's 15 or above, e.g. 30G45 no reason other than being chased by zombies will get me off the ground.