Rage deletions are when someone deletes shortly after being PK'd. It may be after dying in any way, actually, I'm not completely certain.

Aura/Barrier/Shield. These are damage reduction spells that are generally available to PC's only via magical items such as wands, talismans, potions, and scrolls.

Race is a large determining factor in age death. There is some randomness (it's not "100 for every human, 500 for each elf, etc.") involved. Also, the WITHER commune can reduce your age-death sometimes. Some equipment can age you or (rarely) reduce your age, also. It's is, in the end, based on how many hours you've played (someone who plays only 10 hours per month will age death long after someone who plays 100 hours per month).