We build a life-cycle model in which a representative firm produces a final good using routine and non-routine labor as well as traditional and automation capital (e.g. robots). Robots can substitute for routine labor. We show that both, population aging and higher robot productivity, foster the increased use of robotics. Population aging decreases and progress in robot technology increases long-run output per capita. In both cases, inequalities in labor income, wealth and consumption rise. Although expected advances in automation technologies are able to mitigate or even circumvent output losses in the aggregate and improve consumption possibilities for everyone, this comes at the cost of increased inequality because non-routine workers benefit disproportionately.