it is god who created you of weakness then after weakness gave you strength then after strength will give you weakness and grey hair. surely he makes whatever he wills. he is allknowing and allpowerful.
الله الذي خلقكم من ضعف ثم جعل من بعد ضعف قوة ثم جعل من بعد قوة ضعفا وشيبة يخلق ما يشاء وهو العليم القدير