This song represents the feeling of realizing that you are actually growing up. I feel like this song can relate to anyone in high school because high school is a time in life where you should enjoy every moment because it will go away very fast. https://www.azlyrics.com/lyrics/billieeilish/gettingolder.html

I’m getting older, I’ve got more on my shoulders
But I’m getting better at admitting when I’m wrong
I’m happier than ever, at least that’s my endeavor

This verse is a very important part of the song because growing up comes with a lot of pressure and there is a lot of responsibilities that you need to take care of. The realization of growing up is a very scary thing because you’re not going to be that little kid on the playground throwing snowballs to each other with no stress in life anymore.