Ruled out showing signs of age (5)
I believe the answer is:
lined
'ruled' is the definition.
(I've seen this before)
I don't understand how the remainder of the clue works.
Can you help me to learn more?
(Other definitions for lined that I've seen before include "Of face, marked with creases and wrinkles" , "Strengthened" , "Creased" , "Ruled - wrinkled" , "Marked by seams or wrinkles" .)