Time spent alone has risen up the public and political agenda, reflected in debates about the ‘relationship recession’, social media use and more working from home. But these underlying societal shifts have not affected time spent alone across all age groups equally. This analysis makes use of the most recent time-use data to explore who is spending more time alone, and why. It reveals that young adults, especially young men, are spending more time alone than a decade ago, with young men now spending more than two-fifths of their waking hours alone.