Wrinkle doesn't cover it...
I've always been pretty chilled out about my appearance (not code for I look like a troll and don't care, just that I rarely wear much make up and haven't spent a lot of time thinking about it or worrying about ageing etc until now iyswim).
BUT...I have a deep line between my eyebrows which has developed quickly in the last few years and I can't pretend it doesn't bother me anymore. It's not even central. 
I am 31, have good but slightly sensitive skin and very few other lines. I use the no7 serum and a light moisturiser, which seems to suit my skin fine.
Short of actual polyfiller, I'm not sure a skincare product, ££ or not, can undo a deep line? So realistically, what do people do who don't want to live out their days either bring told not to frown or with a heavy eyelash-skimming fringe?