The idea that two people could keep a secret for 50 years is far fetched, the concept that governments across the globe could is absurd.

I would react with extreme skepticism

I would know immediately that it is a scam, and it is originated by Usa.

Nobody else in the world has so much hybris to assume that all governments in the world would work together, or even say the same.

I simply wouldn't believe it.
There's no way so many people could keep something that big quiet for so long.
It would be more than just the leaders, there would be thousands of people involved over the course of decades. Someone would have spilled the beans at some point by now.

I would ask if we could put them in charge now

You think I got time to think about goddamn aliens? I got bills to pay.

"Well no shit..."

I mean, they'd get like one or two afternoons of googling around and watching youtube videos about the aliens biology, but I think I'd lose interest pretty fast

I would just find their presence ontologically interesting. Nothing else I can do because I can’t trust any government

Wouldn't care, everyone would be over it in a week. And before then, the social media would blow up trying to get in on the monetization of it. Then life will resume. It will probably be a Tuesday. It's always a Tuesday

Can they fix some of my medical problems (cyborg stuff, if possible?), and/or get me out of here? If not, this video: THOSE DAMN ALIEN BASTARDS ARE REAL. (Gianni Matragrano as Duke Nukem)

Woah. Cool

Well, it depends on what happens afterwards. If the UN just says that they know about it but don't show anything, I'd be excited but if nothing happens then I'd just continue what I'm doing. I'd certainly keep a closer eye on things and try to find out as much as I can. But, what I'd wonder about is the implications. If the government said "yeah, aliens have been here this whole time." Then what would that mean for the world? If aliens are here then certainly they could've been exchanging ideas and technology since they mostly came from somewhere far away. And, if it turns out these ideas and technology that could potentially fix a lot of problems we have on earth, like replicators from star trek, or the cure for every disease, or emission less transportation, and they knowingly withheld this in order to 'keep the secret' there will be hangings and assassinations. I'd be excited but cautious.

I would tell my husband he was right, and would be very surprised.

But it would have to be the actual aliens making the announcement for me to believe it.

I would demand proof