@twojumps SC - she's mainstream pop rather than 'young people music' so it's not an age thing and you're not getting worse!
About half her audience are 18-25, about 20-30% 25-35. Appeals to a particular target demographic. She signed to Hollywood Records (Disney), starred in Disney Channel output. Niece of megastar Nancy Cartwright (Bart Simpson's voice and and decorated scientologist - as she donated millions). Opening act for Taylor Swift.
It's not, not cool, if you haven't heard of her before or not into her music. Not related to Karen Carpenter although SC has sung covers of KC songs.
Similarity to other songs - music often sounds alike because there are only 7 notes in each key, and the same underlying sequence of chords is used, and different keys, arrangements and instruments, and styles but the same chord progression.