I fear that when I was younger there were mornings when I looked luteous.

The word luteous comes from the Latin lūteus (golden-yellow, orange-yellow), which itself derives from lūtum, the name of a plant (Dyer's Weld or Greenweed, Reseda lūteola) used for dyeing yellow.  It describes a color that's a greenish-yellow, muddy yellow, or deep orange-yellow, akin to clay or egg yolk, and often used in botany and biology for specific shades of yellow, like dull egg-yellow in fungi. 

According to the Oxford English Dictionary (OED), the earliest known use of the adjective luteous in English is from the mid-1600s.  More specifically in the In the writings of Thomas Blount, 1656, and in a translation by Richard Tomlinson, 1657.  The OED indicates that this adjective is now considered obsolete, with its last recorded use around the mid-1700s.

Examples of "luteous" in a sentence: 
"The artist captured the marshland's essence with strokes of pale green and luteous yellow." 
"His skin, aged and weathered, held a luteous tone, like old parchment." 
"The rare beetle's wings were a shimmering luteous hue, almost golden, but with a hint of moss." 
"As the fire died down, the embers glowed a deep, warm luteous color." 
"The insect's antennae were slender and luteous, tipped with black."