Roughly 32% of those reporting [long haul] symptoms at day 61+ in our study were initially asymptomatic at the time of SARS-CoV-2 testing.

Age distribution of all SARS-CoV-2 infected individuals at day 0-11 very closely mimicked that of the long-haulers, suggesting the latter group are distributed across all age groups with persons ages 50-59 range (± 20 years) representing more than 72% of the long-hauler population.

Medrxiv paper