The percentage of the population that is transgender varies depending on the source and the age group being considered. According to a study by the Williams Institute at UCLA School of Law, approximately 1.6 million people, or 0.6% of Americans ages 13 and older, identify as transgender. Among adults, the percentage is lower, at about 0.5%. Another study by Pew Research Center found that 1.6% of U.S. adults are transgender or nonbinary. The same study found that adults under 30 are more likely than older adults to be trans or nonbinary, with 5.1% of adults younger than 30 identifying as trans or nonbinary. A meta-regression of population-based probability samples found that the estimated proportion of transgender individuals based on surveys that categorized transgender as gender identity was 0.39%. It is important to note that these estimates are subject to change as societal attitudes towards gender identity continue to evolve.