People born in the 21st century are now playing professional sports:
http://www.cbssports.com/nhl/news/canadiens-player-becomes-first-athlete-born-in-2000s-to-play-in-north-american-major-pro-league/
http://www.sandiegouniontribune.com/sports/chargers/sd-sp-chargers-alex-spanos-owner-dies-20181009-story.html
Read the comments at the end of the article.