Starts to seem old and somehow sage (4)
I believe the answer is:
ages
'starts to seem old' is the definition.
I can't judge whether this definition defines the answer.
'somehow sage' is the wordplay.
'somehow' is an anagram indicator.
'sage' with letters rearranged gives 'AGES'.
'and' is the link.
Can you help me to learn more?
(Other definitions for ages that I've seen before include "... of Man, according to WB Yeats" , "Sage (anag)" , "Donkey's years" , "Yonks" , "Grows old like sage" .)