The radiant "glow" that attractive females have from ages 18-20 when they're in their youthful prime. After age 20, the glow fades and they then age like milk, never to have that youthful "glow" ever again.
Pwally: "Chloe Mortez has a nice glow to her"
Succeeded: "yeah i agree, too bad that glow will fade when she hits 21"
jro9999: "girls with no glow are a no show"
mareewanna: "she better have glow or it's a go no"