Since we haven't met aliens yet, and interstellar travel would take ridiculous amounts of time and energy, I don't think any of us alive will meet aliens. It's

Since we haven't met aliens yet, and interstellar travel would take ridiculous amounts of time and energy, I don't think any of us alive will meet aliens. It's like saying none of us will experience an ice age. Even if they do happen regularly, it happens regularly on geologic time scales, so it isn't going to happen in your life span. There might be so many stars out there that aliens are bound to happen, but crossing stars takes so much time and energy it isn't going to happen often.