The good news is, no matter how old you are, cartoons can be very beneficial to you! Don't judge it as being too childish or boring. It's actually a very good way to learn, especially if you can't live in the language environment.
It can help develop listening skills, new vocabularies, and help you become familiar with common everyday words. If there are subtitles, you can practice reading it to improve pronunciation and reading skills. Furthermore, because of the simple context of cartoons, it's much easier to learn tenses that way. Even a cartoon with no dialog like Tom and Jerry can be used to help you practice writing. The possibilities are endless!
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If you want to watch cartoons with transcript to follow, take a look at this website.