Lyric discussion by qewl 

Cover art for Oh, Ms. Believer lyrics by Twenty One Pilots

I see this song as coping with uncertainty (in Tyler's case possibly religion) and misbelief. Sorting through doubt and questions with no answers is a slow and arduous process, and can feel like walking through thick snow. As you get older these fears and uncertainties don't go away, but rather increase in number. Hence, as we grow older, we get colder.