"I hate most of what constitutes rock music, which is basically middle-aged crap"

This quote by Sting reveals his ridicule for the existing state of rock music. He believes that much of what is thought about rock music today is "middle-aged crap", indicating that it is obsoleted and unoriginal. He is likely referring to the reality that much of the popular rock bands these days are consisted of older artists who have been in the industry for years. He believes that these bands are not pressing the boundaries of rock music, but rather counting on the exact same tired formulas that have been used for many years. He is likely requiring a new generation of rock artists to come forward and produce something fresh and interesting. He wants to see rock music progress and progress, rather than stay stagnant and uninspired.