>These percentages have held up as I’ve spoken to people from many walks of life in libraries and bookstores; teenagers in high schools; physicians in medical c

>These percentages have held up as I’ve spoken to people from many walks of life in libraries and bookstores; teenagers in high schools; physicians in medical centers; and investors and entrepreneurs at business conferences. The percentages are the same for groups of teenagers, and for groups of physicians investors and entrepreneurs. There could be a jump at 60+, but based on his data there isn't a difference between teenagers and working adults.