Her album is called '19' because she is, well, 19 years old.
Reasons why this is wrong:
1) It shows an abject lack of creativity.
2) Clearly, she is implying that her songs represent how a nineteen-year-old woman feels about life which is bollocks because a) most of the songs were written before she was nineteen, and b) a product of a stage school is hardly a typical young woman.
3) It exploits her age as a marketing tool which is as bad as exploiting her body.