etymology - What's the origin of the phrase "to be young and in love"?

I ran a quick search of the Google Books archive to see if I could find a plausible candidate. There were some hits for the phrases:

To be young and in love

and

To be young and to be in love

in the nineteenth century, but none seemed particularly likely to be influential. There was a review of a Henry Wadsworth Longfellow novel, and a novel call "In Kedar's Tents," and a Rider Haggard novel "Dawn," all of which used such a phrase, but nothing seemed to explicitly refer to an earlier use. Neither phrase appeared before the 1880s.

I broadened the search to:

young and in love

and found an early reference, in a play of 1759 called "The Guardian":

Ay, ay, they are such fops, so taken up with themselves! Zounds, when I was young, and in love--

Again, nothing seemed to explicitly reference this somewhat obscure play.

Based on the scanty evidence, I would suggest that the phrase is an old saying, cliche, or aphorism, originating in the nineteenth century or before, rather than a specific literary reference.