The Phone

Why is it that when you are young, you want to spend hours on the phone with your friends talking about the most minute and meaningless details of your life, and when you are older, the phone is a chore? Sure, I like to talk to friends once a week or so. And, I find it valuable to get some advice or work through some stuff with friends on the phone. But, most of the time, I get pretty overwhelmed when the phone rings . . . I just want to know what causes the shift?