Is it really true that alot of people start listening to softer music as they get older because of their ears?

I don't think it's about them wanting music to be quieter, but more about their personality has changed. Up until my mid-20's, I used to LOVE heavy music. I'd get in my car and just blast the heaviest stuff from Pantera, Mudvayne, Korn, Deftones, Rob Zombie, Fear Factory, ect. I still enjoy those bands from time to time, but now I'm almost 30 and lately I haven't been looking into discovering more heavy bands, but have been enjoying alternative and indi-rock more. I think as you mature, your personality and your perspective on things change so you start to crave a different musical style.