Does live rock have a life span?

[cale262]

I was just reading a thread on RC about a 40yr. old reef tank...it's more than 200 pages starting back in 2006ish, I haven't come across anything where he mentions any rock change. I have read other threads where people talk about "recharging LR" or "cooking LR" every 5 years or so...I've cooked rock myself, it really sheds allot of debris after a few months.