When do gharials mature?

I have an insane amount of gharials because.. well I kinda forgot about em. Still not a single of them seem to grow up. The oldest one is 14.2 years old and still a baby. Is this bugged or do they grow extremely slowly?
 
they don't grow up until 17 years. I had to make two enclosures for them because they had a ton of babies and were all mad because they were overcrowded.
 
i keep a male gharial exhibit, a female gharial exhibit, and i have a breeder pen. When they have babies in the breeder pen, i move the male and female back to their own exhibits. This helps prevent further breeding, and also lets you keep an eye on the babies
 
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