Beast Taming: My System is Bugged

In a beast taming world, as a high school student working part-time at a beast shop, Gu Ming awakens a strange system.

"Halfway through life, and nothing to show for it."
"Seeing that you refuse to accept old age at fifty, Elder Ruan, out of pity, gifts you a Dragon Pet whose time is almost up."
"You have formed a contract with a Time Dragon."

"You call this snake a Time Dragon? "
"And I'm only 18 years old!"