Some competent political actors, primarily young people and the cognitively impaired, are excluded from political participation by modern liberal democratic states. This exclusion occurs because the means utilized by states to distinguish between competent citizens (who must be included) and incompetent ones (who may be excluded) are imperfect. They include age restrictions on enfranchisement and, commonly, legal restrictions on enfranchisement for those with cognitive disabilities. Capacity-testing provides a means to improve on these existing mechanisms for exclusion. It is not, however, often suggested, nor seen as viable. Here, I argue that we should utilize capacity-testing to more effectively include capable citizens in our democratic practice. I defend a particular scope and kind of capacity-testing against common objections.