Answer:
I wear a red robe, with staff in hand, and a stone in my throat.
We are five little objects of an everyday sort. You will find us all in a tennis court.
There is someone, and there is always another, for without the other, there wouldn't be one
I'm not man's best friend, I'm their enemy, I can mark your end, yet you do not see me, I am very small, but very tough, If you have me, then you have it rough.
Both old people and owls are said to be possessing this trait
Iām grown from darkness but shine with a pale light. Very round I am and always a lady's delight.