‘Act my Age’ is the seventeenth and closing track of the deluxe edition of ‘Witness’

On the track, Katy is attacking ageism and talks about it from a female point of view, because when the woman ages, she is constantly told that she will lose her beauty, she will no longer be attractive, her sex life will die completely and many stupid restrictions. Also considering that Katy during her career has received criticism of being “a 30-year-old woman acting childlike and a 13-year-old girl,” this song may be a response to those criticisms.