In his latest Alertbox, Jakob Nielsen publishes the results of a quantitative study on how time needed to complete website tasks increases as you get older. According to the study, there is a 0.8% increase in task time per year for users between the ages of 25 and 60.
Nielsen attributes the increases in time to the human aging process—erosion of cognitive resources, loss of visual acuity, etc. Apparently, the older you get the harder it is to process complex information and tasks on the web.
While there is not enough disparity between 30- and 50-year-old users to warrant different design approaches, Nielsen notes that there is a specific drop-off in ability after age 65. Websites designed for senior citizens clearly need to follow different usability guidelines.
It’s hard to disagree with the Nielsen’s findings, although concluding that older users struggle more than younger users is hardly groundbreaking. The study notes that the age at which people start using the web has some impact on their ability, regardless of age. However, the study does not take into consideration how the types of online tasks you perform vary by age.
Pew Internet released an interesting report on how online activities differ by demographics. While the findings do support Nielsen’s findings, there is equal variance across different demographics such as income, race, and education.

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