Gear Diary’s own “Grumpy Old Man” (aka Mark Hager, aka my awesome father-in-law) is getting an iPhone 5. Thing is, Mark’s daughter (my wife Elana) and wife (Debbie) are both fine with the iPhone 4S, and THEY are far more likely to take advantage of the speed the iPhone 5 will offer. So why is Mark (a troglodyte) getting the iPhone 5? I ambushed him while he was grilling, and I asked…