But those who wait for the Lord [who expect, look for, and hope in Him] shall change and renew their strength and power; they shall lift their wings and mount up [close to God] as eagles [mount up to the sun]; they shall run and not be weary, they shall walk and not faint or become tired. Isaiah 40:31 (Amplified Bible)

I could not find the quote I was looking for but the verse above did explain in part what I am experiencing. In Godspell there is a song called Bless The Lord and the words explain what I am feeling:
He clothes thee with his love
Upholds thee with his truth
And like an eagle he renews
The vigor of thy youth
When I was young I felt so used up and vile yet my body was in it's youth. I did not notice this bodies' youth. I only saw ugliness. Now the wear of years of depletion are showing it's consequences on this abused temple. I am taken by surprise when age reveals it's lines, wrinkles, lumps, bumps, scars and sags on this face and body. I find it interesting how I can feel so full of Life at this time yet see the reflection that I do. I know how I feel is of God. It is His Life that fills me with energy that is difficult to contain. The Word of God is eternal and Scripture (Jesus-the Word made flesh) fills this aging vessel. I feel youthful and excited to share His Love and Eternal Life with others. So I am not going to focus on a mirror that shows me a reflection of this fleeting world. I am going to revel in the Life that pulses through this body directly from Holy Spirit, God Himself. I choose to reflect His Life and not human flesh. I will Live in accordance to His Word as best I can and pray this decision to walk in the promise of Eternal Life will shine His Love onto the darkness bringing others into His eternal glory. Hmm maybe I will even start jogging again (that is if these old worn out knees can handle it and I can fit it in an already very busy day-and mostly if I am brave enough to try it out again-I will think about it- but I should just do it)
A voice says, Cry [prophesy]! And I said, What shall I cry? [The voice answered, Proclaim:] All flesh is as frail as grass, and all that makes it attractive [its kindness, its goodwill, its mercy from God, its glory and comeliness, however good] is transitory, like the flower of the field.
The grass withers, the flower fades, when the breath of the Lord blows upon it; surely [all] the people are like grass.
The grass withers, the flower fades, but the word of our God will stand forever.
Isaiah 40:6-8 (Amplified Bible)