"The consensus of opinion from these scientific sources indicates that the normal speed for most adults is in the range of 64-80 m/min. Our range of 61-91 m/min (and the follow on of slow and very slow ranges) is an approximation from this, and is likely to be inclusive of the majority of people. This then removes any need for segmenting the walking group by age group. While an elderly person may not be able to walk as far and as fast as a young person, they should be able to walk a reasonable distance at a normal pace."