Why do some animals, like kangaroos, not stop growing even in adulthood? What are the advantages and disadvantages of this adaptation?

[codescript94]

Did you know that some animals, like kangaroos, don't stop growing even when they reach adulthood? How do you think this affects their survival and reproduction? What are the benefits and costs of having continuous growth?

 

[Starmix]

Wow, that's awesome growth however, there's no kangaroo in the Philippines so I don't have any idea about it's incessant growth despite already mature. I will do my online research tomorrow. The answer of the question intrigues me.