Ruled, showing signs of age (5)
I believe the answer is:
lined
'ruled' is the definition.
(I've seen this before)
I can't explain the remainder of the clue.
Can you help me to learn more?
(Other definitions for lined that I've seen before include "Covered inner surface" , "Given an inner covering" , "given protection" , "Went along with" , "pockets may be so filled?" .)