[egershna]

Is the mufti implying if a woman has no desire to marry even though still in child bearing age, she doesnt have to wear hijab?

Absolutely not. The Mufti is of the opinion that a woman has to wear an outer cloak (abaya) although an older woman (as in the definition he provides) does not have to wear an abaya but still has to observe the rules of hijaab (i.e. covering everything except for the face and hands, clothes that do not reveal the figure due to tightness or transparency, etc). She does not have to wear niqaab either (which is waajib on a woman otherwise). So basically, everyone, no matter if they are old or young has to wear hijaab