Ask HN: When does a startup become a company?

It seems like these days even the largest and most developed new(er) companies still call themselves "startups". As such, this term gets thrown around a lot. From very early stage to way past late-stage, most tech companies are calling themselves "startups" no matter their status. A couple thousand employees, stable revenue streams, and solid financial backing, but still somehow a "startup".

My question thus is, when does a company cross over and just become a "company" and no longer a "startup"?