Makes sense, change comes with aging (9)
I believe the answer is:
senescent
'with aging' is the definition.
'senescent' can be an answer for 'aging' (synonyms). I am not sure about the 'with' bit.
'makes sense change' is the wordplay.
'makes' indicates an anagram.
'change' becomes 'cent' (I have seen 'Small change' mean 'cent' so perhaps 'change' could also mean 'cent').
'sense' anagrammed gives 'senes'.
'senes'+'cent'='SENESCENT'
'comes' is the link.
Can you help me to learn more?
(Other definitions for senescent that I've seen before include "Showing the deterioration of age" , "Ageing" , "Getting old" , "Growing old" , "characteristic of old age" .)