You'll notice this glow in most women 18-24 (sometimes older if they take care of themselves). But by 28-30 it's surely gone for the majority.
Without a youthful glow women already have the appearance of "used up" and "old" REGARDLESS of their actual age. They look tired and worn down.
A youthful glow projects the peak fertile state in a woman and highest chance for healthy offspring.
That glow subconsciously tells men that she hasn't been jaded and turned bitter by her experience in the world.
Coincidentally a graph on the age that men found women to be most attractive was 18-24.
[I just came across this. I did not make this opinion]
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