I use drop of vitamin e oil at night, and brush them the way I want them to go, up and out with stiff eyebrow brush and trim any that have lost their way.
Before I do my makeup, if I do any, I apply a small bit of eye cream around my eyes and on my eyebrows, I let the cream soak in and pretty much dry and brush them out and up and then I take a angled short stiff (1/8" -1/4") brush and apply a taupe-ish eyebrow color or powder eye shadow of a shade that looks good, but not dark. I don't go dark, as I am blonde/some very white greys mixed in, as too dark and contrasting makes me look stark and older IMO. Pale older skin looks bad with very dark shades of hair or eyebrows IMO.
When I first read your post I thought you meant to put kelp on our eyebrows... to help them behave and grow

Once a woman hits 70...these days, most Boomer women plucked their eyebrows in the 60s - 70s? and now the follicles are dead, so no eyebrows and the ones that are left behind are sparse and or acting wiry?