Span of Attention
It seems to me that span-of-attention increases with age but decreases with seniority. This was once demonstrated to me when I lent a videotape to a group of senior managers. The video was in two parts, separated by a period when the screen faded to blue (not black). When the first part had finished the managers assumed that the video recorder had gone wrong so they switched it off. Later I timed the interval between the two sections of the tape. It was six seconds!