How old?

[rebbonk]

A chap is in a museum in Dublin looking at a huge skeleton of a T-Rex.

He asks the curator "Excuse me, how old is this exhibit"?

They curator replies, "One million years old and eight months"

The chap asks, "That's amazing! How can you be so accurate with the age"?

The curator replies,

Spoiler:

"Well, it was a million years old when I started and I've been here eight months"