Importing the class

Link to importing-the-class

It might be required for you to import the package if you encounter any issues (like casting an Array), so better be safe than sorry and add the import at the very top of the file.

ZenScript
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import crafttweaker.api.entity.type.misc.AgeableMob;

Extending PathfinderMob

Link to extending-pathfindermob

AgeableMob extends PathfinderMob. That means all methods available in PathfinderMob are also available in AgeableMob