Comment #7 on issue 140 by trond.norbye: "stats items" does not return correct "age" value
http://code.google.com/p/memcached/issues/detail?id=140
From your test the item "a" would be in the tail of that LRU. what is the expiry time for that object?
Please note that memcached does everything lazily, and will not look at other objects than the object in the tail. There might be objects that are expired somewhere in the cache, but they are not inspected until they hit the tail in the LRU or someone tries to fetch them.
