Gerontogrowth and aging represent two different demographic realities that manifest themselves with varying rhythms and intensities in the Atlantic. Although the population is relatively young, the increase in the elderly population is very rapid. Such an evolution questions. How does this process work between the different territories? What are the local implications? The goal of this paper is to analyze the trajectory of these two phenomena in the Atlantic between 1981 and 2011. The empirical material used is based on data from the various Statistics Canada censuses. The evolution of the number and proportion of seniors is highlighted with certain characteristics related to the settlement structure, the economy and income levels. The results reveal that rural areas and, more specifically, small populations, are more prone to aging compared to cities. Nevertheless, gerontogrowth is also the result of the rural world, where the majority of localities struggle with this reality. As the most aged municipalities tend to be far from the cities and suffer from demographic decline, a public policy for the elderly should also be part of a land use strategy.