Whats the stanza form Robert Browning invented for Love Among the Ruins?

Grow old along with me!

The best is yet to be,

The last of life, for which the first was made:

Our times are in His hand

Who saith "A whole I planned,

Youth shows but half; trust God: see all, nor be afraid!

was not invented for Love Among the Ruins but is indeed a poem penned by Robert Browning entitled Rabbi Ben Ezra. The poem itself is a dramatic monologue by the elderly rabbi in counselling a young man.