The coelacanth — a giant weird fish still around from dinosaur times — can live for 100 years, a new study found.

Scientists long believed coelacanths live about 20 years.

But by applying a standard technique for dating commercial fish, French scientists calculated they actually live close to a century, according to a study in Thursday’s Current Biology.

But the French scientists found they were missing smaller lines that could only be seen using polarized light — the technique used to figure out the age of commercial fish.

Using the technique, the scientists studied two embryos and calculated the largest was five years old and the youngest was nine years old

So, Ernande said, they figured pregnancy lasts at least five years in coelacanths, which have live births