Combining age groups together, those aged 14 and below, consisting of the the young dependent population which include infants/babies, children and young adolescents/teenagers, make up an aggregate of 31.24% (587). Those aged 15 up to 64, roughly, the economically active population and actual or potential members of the work force, constitute a total of 62.59% (1,176). Finally, old dependent population consisting of the senior citizens, those aged 65 and over, total 6.17% (116) in all.
The computed Age Dependency Ratios mean that among the population of Lumbo, there are 50 youth dependents to every 100 of the working age population; there are 10 aged/senior citizens to every 100 of the working population; and overall, there are 60 dependents (young and old-age) to every 100 of the working population.
The median age of 26 indicates that half of the entire population of Lumbo are aged less than 26 and the other half are over the age of 26.
The population of Lumbo grew from 1,086 in 1990 to 1,879 in 2015, an increase of 793 people. The latest census figures in 2015 denote a positive growth rate of 2.05%, or an increase of 190 people, from the previous population of 1,689 in 2010.