Well, considering there is 8760 hours in a year, which would mean dying 4 years earlier, I think I'd continue playing games, because I doubt I'd even reach that many hours of gameplay. The game I have spent the longest completing are Persona 3 and 4, both around 50-60 hours. That means I could complete those games 159 times in my life and lose 4 years. Considering the games took me roughly a month each to complete, and that's with not much else going on, so with work etc. on top of that say it takes 2 months to complete 55 hours of gameplay, that would mean it would take 26 years to do one year of solid gaming. Would I play that many games as an adult? Probably not.
So what I have done here is really over thought this topic and done some maths. But it lets me say yes, yes I'd continue gaming. Even if I lost 4-6 years of my life, it would come off the end, and by the time I get old life expectancy will probably be well into the 80's anyway, and who wants to be that old?