”Fylla” in Swedish is a peculiar verb meaning ”to have birthday”, to ”turn X years old”. Look at these examples:
- Jag fyller år i dag. = It is my birthday today. (lit. I fill years today)
- När fyller han år? = When is his birthday? (lit. When fills he years?)
- Jag fyller tjugoett i morgon. = I turn twenty-one tomorrow. (lit. I fill twenty-one tomorrow)
So the sentence ”Jag vill inte fylla femtio” means that the speaker does not want to become fifty years old. You can imagine it’s his/her birthday tomorrow and s/he is not looking forward to it and says ”I don’t want to turn fifty [years old]”.
can i use fylla for other festive occasions? say it's been ten years since we finished highschool and we're getting together with old classmates and teachers. can i say vi fyller tio? in this case? or, a better example, if i celebrate say 5 years of marriage. can i say vi fyller fem? tack!