In reply to AlanLittle:
I dont worry either about the age of cams, just get a bit pissed off how often the trigger wires break.
Some very old cams seem to have wobbly lobes, either though wear or overloading in falls.
Use these cautiously as the lobes could more easily collapse sideways in a fall especially in rounded pockets.
New kit is always going to be stronger than used but still probably strong enough - Hopefully.
Just be sensible.