Immune

We can often find ourselves thinking and acting as if, while everyone else might grow old, get sick, and die sooner or later, we ourselves are somehow immune. We stand outside such ills, remarkably somehow not reflecting on the fact that, if we actually were immune, we’d be first.

In this text, the last part is really tough for me to understand. If we were immune how we would be first to grow old, get sick and die…? Shouldn’t we be last? Do I misunderstand something here?

Thanks in advance!