/kloc-how old is 0/trillion years old?

1 trillion years old =1000 billion years old = 1000000000 years old, so it is one trillion years old.

Zhao is a first-class word in the General Standard of Chinese. This word first appeared in Oracle Bone Inscriptions in Shang Dynasty. The original meaning of this word refers to the crack that indicates good or bad luck when the ancient people burned Oracle Bone Inscriptions in divination, and it is extended to omen and ominous sign. Later used as a verb to show in advance. In addition, it is also used as a numeral, which generally refers to a large number, one refers to one million, one refers to one trillion, one refers to one hundred million, and generally refers to a lot.