In recent years, the debate about demographic changes and its impacts on the economy has increased. The growth in the relative share of elderly people in the age pyramid may occur in the coming decades in many parts of the world, and their effects on the composition of consumption, notably on energy demand and emissions, are not yet known. This article estimates the changes in the pattern of consumption in Brazil due to the changes projected in the age pyramid in 2050 and the consequences of these changes on CO₂ emissions. For this, projections will be made using an input–output model for the Brazilian economy for the year 2010 considering 67 productive sectors and six age groups. The results suggest that emissions grow less than proportionally to population growth and that the participation of sectors such as fuels and transport shows a small decrease in the consumption vector for 2050.

近年来，关于人口变化及其对经济影响的辩论有所增加。未来几十年，世界许多地区可能会出现老年人在年龄金字塔中的相对比例的增长，但尚不清楚它们对消费构成的影响，尤其是对能源需求和排放的影响。本文估计了由于 2050 年年龄金字塔预测的变化而导致的巴西消费模式的变化以及这些变化对 CO _{2 的影响}排放。为此，将使用投入产出模型对 2010 年巴西经济进行预测，考虑 67 个生产部门和 6 个年龄组。结果表明，排放增长与人口增长不成比例，燃料和运输等部门的参与表明 2050 年的消费向量略有下降。