I never plucked my eyebrows when younger, but they are still sparse now, so think it is just an age thing. I pencil them in, not very evenly, but I heard a beautician say that brows can be siblings rather than twins, so it doesn't matter if they don't exactly match each other.
I bought one of the JML pens which are being advertised on TV at the moment, but the colour is far too dark even though I chose dark blonde, the palest. I can rarely find a pencil to match my hair colour which is greying dark brown. The best I have found is a Top Shop grey/brown one which has been discontinued, so have bought all available ones on Ebay!
I wouldn't be brave enough to have microblading in case it was too false-looking. I don't wear much make-up apart from mascara.
There have been previous threads on this subject so a search might reveal more helpful comments.