Lets put it this way, I used the some of the Titleist tour 384 and professional balls vs. my pro v1's last year with my old Ping eye 2's and they were not any shorter. They've just been downstairs in my house.
How old are they?... no idea... I just looked up the Maxfli Rev's and saw them on golfreview.com from 2009. I think they're all from around then. I'd have to google but I didn't think balls lost life anymore sitting at home, just bad if they are outside, underwater etc... Again, something for google.