So, I've seen a few different theories about older balls on modern lanes. My question is, how old is too old? Let's say you buy a nice new ball today, and don't get it drilled for 1, 2, 5, 10 years from now. When does the oil change enough that the balls performance gets affected? My oldest ball I'm using now is creeping up on 2 years old, and I don't see any performance difference at all. I've kept up with maintenance, get it sanded when it starts to look shiny; all that jazz. Assuming the cover doesn't absorb too much oil and maintenance is kept up, how long will I continue to see the same reaction?