It's funny to think infinity has an endpoint. Like something can be infinitely big but not infinitely small. Looking at it with basic geometry, Ray AB stops at A, but passes through B to continue on to infinity. Naturally, infinity cannot exist for the sole reason that universe is still expanding so it has a definite and finite border, even though that border changes every second. The real question is "is there anything beyond our universe?" if so, then infinity has a higher chance of existing. Also, we can look at atoms, and subatomic particles. If each has something inside it, like a quark, and the quark has something inside it and so on and so forth, infinity would exist. When You say infinity, you usually think number, distance, or size. But what about time. When was the start of time? The Big Bang? Sure. But when is the end. Keep thinking...