what does the item's 'age' stat mean?

[Steven Grimm]

John.H wrote:
> STAT items:33:number 100
> STAT items:33:age 6150
>
> And I want to know what does the age mean?

It is the age in seconds of the item that will expire next in each slab 
class. (A slab class is a range of item sizes, more or less, and each 
range maintains its own LRU queue.) Once your cache fills up, you can 
use the age stat to determine your cache's turnover rate.

-Steve