Here is the timespan that will be the most unpredictable. These few years are going to require the most resiliance and adaptability to change. As a singer, you are constantly needing to change your image, your music, your attitude, etc. to what your fans expect. For example, if I begin my career as a Pop singer, but the music industry changes from a large fanbase in Pop music to a large fanbase in another style of music, then to continue being successful, i will need to be able to adapt.