A metric used in quantitative usability analysis to compare user efficiency is the time to complete a task where
a difference of 43% of time spent between elderly and young users came to light. The predominance of gray tones
and the lack of prominence of the messages in the interface have been criticized by all participants, especially the
elderly, who pointed these out as the main reasons for delay, increasing the task execution time.
The average test time for young users was approximately 18 minutes while the average among elderly users was
30 minutes, representing a 67% difference. However, when comparing the slowest elderly participant to the fastest
elderly participant, there was a gap of almost 15 minutes, which demonstrates the difficulty in standardizing the
profile of this user type. Nevertheless, the elderly user who completed the test the fastest made almost the same
time as the younger user, confronting the 43% rate reported in the latest study conducted by Nielsen. This user was
the most experienced of the elderly group, indicating that the time metric may vary in some situations, even to the
point of equating the efficiency of the elderly user to that of the young user.