I LOOK into my glass,
And view my wasting skin,
And say, "Would God it came to pass
My heart had shrunk as thin!"
For then, I, undistrest
By hearts grown cold to me,
Could lonely wait my endless rest
With equanimity.
But Time, to make me grieve,
Part steals, lets part abide;
And shakes this fragile frame at eve
With throbbings of noontide.
The slow pace continues with the elongated vowels in line three — ‘shakes’, ‘frame’ and ‘eve’. The  alliterative  ‘fr’s in 'fragile frame’ also slow the pace. If spoken aloud this line is diffult to say, something of a tongue-twister. 
 The references to ‘noontide’ and ‘eve’ to represent the prime of life and the end of life respectively, are common tropes in literature and music.  However, the choice of ‘throbbings’ to signify vibrancy and youthfulness provides a contrasting note of originality. 
 The resolution, though, is sad and hopeless. The speaker has the spirit and yearnings of youth in the failing body of an aging man. 

I Look Into My Glass