Well, give proper medical treatment to your old (7)
I believe the answer is:
healthy
'well' is the definition.
(similar in meaning)
'give proper medical treatment to your old' is the wordplay.
'give' is a charade indicator (letters next to each other).
'proper medical treatment' becomes 'heal' (I am not sure about this - if you are sure you should give a lot more credence to this answer).
'to your old' becomes 'thy' ('thy' historically meant 'your').
'heal' next to 'thy' is 'HEALTHY'.
Can you help me to learn more?
(Other definitions for healthy that I've seen before include "In good condition" , "Wholesome" , "In the pink" , "Hale and hearty" , "Free from infirmity or disease" .)