The shelf like for a pop star is 10 years, after that, they are done. Katy ruined her career immediately she cut her hair and went blonde. All her quirky sexy appeal disappeared thanks to the atrocious hair cut.

this song and video still hold ups after so many years.

Teenage dream is an iconic album that deserved to win at least one Grammy.
5 number 1 songs from one album , I don't think anybody can achieve such again.