The online survey of more than 1,000 French adults found that young adults are the most likely to support period-related policies and accommodations. Nearly 75 percent of respondents between the ages of 18 and 24 said they were in favor of menstrual leave, compared with 36 percent of adults over 54. And 82 percent of young adults said they believed periods could hinder women at work, compared with 53 percent of older adults.