I just looked in the database and see that there are only two verses there. I have a book called "Songs of the Pioneers", compiled by Albert Brumley, which includes another verse. Lyrics by George Johnson:

3rd verse
They say I am feeble with age, Maggie,
My steps are less spritely than then
My face is a well written page, Maggie,
But time alone was the pen.
They say we are aged and grey, Maggie,
As spray by the white breakers flung,
But to me you are fair as you were, Maggie,
When you and I were young.

alice in montana