Vortices of Extelligence

“Count your life by smiles, not tears…”

There's a beautiful poem that seems to be quite popular, even though I only found it recently:

Count your garden by the flowers,
Never by the leaves that fall -
Count your days by golden hours,
Don’t remember clouds at all.
Count your nights by stars – not shadows,
Count your life by smiles – not tears -
And with joy through all your lifetime
Count your age by friends – not years.

However, I cannot seem to find any kind of attribution anywhere, no mention of an author, no anything. Well, in a couple of places I've found references to someone named “Dixie Wilson”, but not much more.

So… does anyone recognize this poem? Who's the author? What's the poem itself called?