Both "i look into my glass" and "when you are old" include a point of view of

Both poems from different authors include a point of view of aging.

I look into my Glass by Thomas Hardy talks about himself and how he notices the big change he had as he was growing old, he talks about his feeling and how they're still the ones he had once as a young man.

When you are old by William Buttler Yeats talks about his beloved one and the kind of love people may have towards her, this poem was written way before she was old but it is possible that it was a thought about the years to come.

this answer was editing it cause i couldn't delete!

edwards uses the phrase "o who can express what the state of a soul in such circumstances is! " in order to illustrate that this type of suffering is unimaginable. the word "express" denoted that the state of a suffering soul is required to be described by any person, but it would not happen because no one can imagine how this suffering is felt.  

-show what might happen if the reader disobeys edwards is not correct because this is described trhough the text, not by the phrase used.

-describe what endless suffering looks and feels like is not correct because this description might be the porpuse of the excerpt provided, not the porpuse of using the phrase during the writting.

-prove that few people have survived limitless suffering is not correct because it is implied that the soul of a person is already suffering and doesn't have any way to escape.