If anyone asked me: "Do you think aliens exist?", I'd reply saying yes. If anyone asked me: "Do aliens exist?", I'd reply saying "Maybe they do, it depends..." because hear me out~
Alien life: it exists.
It might exist in the strangest way we couldn't even have imagined of. Life itself is a broad notion, according to our reference point, it's stuff that can breathe or reproduce. But, something is defined as "living" if there's emergence in play. That's the basic foundation of life.
Emergence: things (either living or non-living but since we're trying to define life, let's assume non-living things) coming together as a group to perform one function. That is life. Just like how proteins came together to turn into the first living cell, on a whole new different planet, a whole new compound might have come together to perform a whole new function (it might not be breathing or reproduction, since that's our current reference point for living things) and it'd be a whole new living thing; something we couldn't even have imagined of since our perspective is in a whole other world or even dimension. So, aliens exist. But again, it depends on what "alien" means to you and what scientists mean when they say they're "looking for alien life out there".
