As a suggested title for this poem, with tongue well in cheek, how about ‘Tale of Two Swans’ or
‘Song of Two Swans’ –

The poem may be more of a tale than a song but I like ‘song’. I do see some parallel with the expression ‘swan song’, although less than perfect as this duo are not a step from death’s door. The swan is beautiful and graceful and clearly, this couple see beauty in each other no matter the ravages of age. Swans are notoriously argumentative; they seem to enjoy a good round of hissing and pecking and wing flapping but then will settle down quite peacefully, perhaps waiting for the right moment for round two. And 'white' swans might suggest the last line 'washed cleanly of their sins'.

Not sure any of this makes sense but that is my reasoning.

I had to look up the meaning of 'swan song'. The more common modern usage is a last performance before retirement rather than the last song of the swan before death. I thought that this fit in nicely with 'inharmonious' and the line, It reached a sweet crescendo, and retirement suggests the beginning of a new phase of life rather than the end of life as in the mythical 'swan song'. I have never pictured swans as being argumentative, maybe geese, but not swans.

Sea of Love

Sleek ship’s a-sail,
Tall masts and mighty beam,
Navigating the brightest stars,
Upon a constant, boundless sea.

Not shore, nor shoal, nor swell,
Nor worn plank or blissful barnacle
Can impede her speed or trouble
Her firmly held rudder.

Not young, not old, but in between,
Upon a shining sea of love,
A family’s love,
She sails the steady current and gentle breeze.

Untold horizons, far places to be,
The sea of love shapes her destiny.

Sunrise at Byron
Captured in the sand
And the dew on the leaves
Whip birds'
sonic scythes
Cut the canopy
While bush turkeys
Sort the fallen
Debris

The Pets Add Life campaign holds a poetry contest for 3rd, 4th, and 5th graders - I'm really amazed at how good some of the poems are! You can read them here: http://petsaddlife.org/poetry_contest/