I suspect that this largely depends on who you talk to, at least as much as it depends on age. I'm pretty young and I have a cell phone and I plan everything a

I suspect that this largely depends on who you talk to, at least as much as it depends on age. I'm pretty young and I have a cell phone and I plan everything a total of about an hour in advance; if it involves me driving a few hours or involves me herding other people, I might or might not plan it a day in advance. However, I know other people in my peer group who plan all kinds of things weeks or months in advance, and ask me every time about those things, leaving me to shrug haplessly.