Also chewbacca didn't seem to age. Wonder what his secret is.
Wookies have a lifespan of several hundred years. While the 30 year span from ROTJ to TFA for humans might be significant, in the lifespan of a Wookie, 30 years could be more like 4-5 years for us, possibly even less.
As stupid as it may sound I think it's a sad and smart decision at the same time because he is putting his family and longterm health over his hockey career and by all accounts Dupuis had a very solid one and even won a cup. So hopefully he can now enjoy his post career without health problems and maybe stay involved in some form.
Not stupid at all. No matter how long your playing career is, at some point there is going to be a life afterwards. Better to retire with a shorter career and have a longer life, than the other way around...
Best of luck to him with whatever his future plans are.