I’m watching the first season of CSI on DVD, and it’s amazing how much younger everyone looks. It’s not even been four years. I think part of it is the makeup and lighting being focused on MAKING them look older and darker now. These early episodes are about three times as well lit as the modern ones. It’s like at some point they decided to rip out everything but the desklamps. Either that, or these people are so in character that the stress has aged them 15 years in a third of that.