Who are the top 10 youngest us male singers with a number 1 single?

As of October 2023, the top 10 youngest male singers to achieve a number 1 single on the Billboard Hot 100 include Justin Bieber, who was 16 when he topped the chart with "Baby," and Lil Nas X, who reached number 1 at age 19 with "Old Town Road." Other notable young male artists include Stevie Wonder, Usher, and Shawn Mendes, each achieving their first number 1 hits in their teenage years. The list may vary slightly depending on new releases and chart updates.