(No worries, there is no such thing as “off topic” here at TheCatDude.Net.)
Yes, you can use beard oil on your eyebrows. It will give them a wonderful shine and make them appear thicker. Just be sure you don’t get breadcrumbs in them or coffee stains. Also, if you notice a few lighter ones popping up where dark ones used to be, that just means you’re getting old. If you haven’t done it already, you better start hitting the gym. If you are fairly wealthy, it probably won’t be as necessary, because your income will attract the fairer sex just fine – beer belly and all.