A growing body of evidence suggests that the reported frequency of certain everyday involuntary and voluntary forms of cognition decreases as people get older. Research in this field has focused on mind-wandering and autobiographical memory, typically exploring them independently of each other; future thinking, semantic memory, and musical imagery remained largely unexplored. Furthermore, the findings about contributing factors to age-related frequency changes remain inconclusive, whereas phenomenological characteristics such as vividness and affective valence have been overlooked. Our study investigates, for the first time, the relation between chronological age and simultaneously the frequency and phenomenological characteristics of involuntary and voluntary mind-wandering, autobiographical memory, future thinking, semantic memory, and musical imagery. In addition, we explore attentional control and confidence ratings as factors that could explain age-related frequency changes in involuntary and voluntary forms of cognition. A sample of 675 individuals, ranging in age from 18 to 90 years, completed an online questionnaire about the characteristics of their involuntary and voluntary forms of cognition, as well as measures of reported attentional control, and confidence in their responses. Our findings point to an age-related decrease in reported frequency for all forms of involuntary and voluntary cognition, which could not be accounted by attentional control or confidence ratings. Vividness and affective valence of involuntary and voluntary cognition forms were associated differentially with age. We discuss the findings in relation to theories of cognitive aging and socioemotional development and their implications for involuntary and voluntary cognition research.