Jon Postel was murder/assassinated.
If we look at jet aircraft, wear depends on the airframe and the engines, and the airframe seems to be the number of pressurize/depressurize cycles as well as the running hours. Engines get swapped out routinely but when the airframe has enough stress it's time to retire the aircraft lest it suffer catastrophic failure. Rockets are different in scale (much greater stresses) but we can expect the failure points due to age to be those two, with the addition of one main rocket-specific failure point: cryogenic tanks.
How long each will be reliable can be established using ground-based environmental testing. Nobody has the numbers for Falcon 9R yet.
Weight vs. reusable life will become a design decision in rocket design.
I can dig it. I've looked up some songs and found that I liked my misheard lyrics better. Toto's "White Sister", for instance:
How can you say you love me?
You don't even love yourself
You live your life like a dog at night
Just waiting on the step
I'd rather see pro football remain as it is, but also see all school sponsorship of the sport ended. Let the adults who want to make a profession of the game go into it with their eyes wide open, not indoctrinated as impressionable young people. If the sport dies from lack of participation, so be it.
Let it die. The trend for every decade I've been alive is that more brains are needed to survive in the workplace, not less. Not only are the jobs more skilled, there are more rules to follow--- you have to have the mental wherewithal to know when you can and cannot say "fucked her right in the pussy", to use one famous example. We don't need otherwise healthy people starting at a deficit because they placed some game during their developmental years.