I'd say it's reasonable to call 16 "nearly" 20 years. It certainly rounds off that way.

It launched August 28 2006. I'd say it's reasonable to call it fifteen years. This is tech.

Fifteen years is nearly 20 years. So, both is correct. I'm not sure what your point is other than splitting hairs.

By this logic, five years is almost ten years, and fifteen years is almost ten years. Go figure.