Title: Tom Brady
Content:  Thomas Edward Patrick Brady Jr. (born August 3, 1977) is an American football quarterback for the Tampa Bay Buccaneers of the National Football League (NFL). He spent his first 20 seasons with the New England Patriots, where he was a central contributor to the franchise's dynasty from 2001 to 2019. Brady is widely regarded as the greatest quarterback of all time. After playing college football at Michigan, Brady was selected 199th overall by the Patriots in the sixth round of the 2000 NFL Draft, later earning him a reputation as the NFL's biggest draft steal. He became the starting quarterback during his second season, which saw the Patriots win their first Super Bowl title 
Title: Tom Brady (rugby union)
Content:  Thomas Brady (born 10 February 1991) is a professional rugby union player who last played for the Leicester Tigers in Premiership Rugby. Previously Sale Sharks in Premiership Rugby. He plays on the wing. He currently plays in the French ProD2 for US Carcassonne. On 29 February 2016 it was announced he had signed for Leicester Tigers for the 2016/17 season. He made his starting debut against his old side Sale in Salford and made his first start at Welford Road against Worcester on 8 October 2016 where he also scored his first try for the club. Tom scored the winning try vs Exeter Chiefs in the Anglo Welsh Cup Final at The Stoop in his first season with the club.
Title: Tomás Brady
Content:  Brady switched codes in 2012 by announcing that he would be concentrating on inter-county football instead of hurling. He will work under the new Dublin manager Jim Gavin. Brady's switch to football was described as "very disappointing" by the Dublin Senior Hurling manager Anthony Daly, but he wished him the best of luck in his future season with the senior footballers. Brady ruptured his anterior cruciate ligament in June 2013 which ruled him out for the rest of the season. As of July 2014, Tomás has had two championship appearances for Dublin with a scoring tally of 0-02.
Title: Tomás Brady
Content:  Tomás Brady (born 6 November 1987) is a Gaelic footballer and hurler who played for Na Fianna and Dublin.
Title: Tom Brady
Content:  of the greatest athletes in sports history. Brady was a lightly regarded prospect coming out of college, with an unimpressive NFL Scouting Combine performance reinforcing this reputation. As a result, he was not selected until the sixth round of the 2000 NFL Draft by the New England Patriots, 199th overall, and was the seventh quarterback taken. Brady's success as a passer has been attributed to his work ethic, competitive spirit, pocket awareness, and intelligence. Brady has started 346 games (301 regular season, 45 playoff) in 22 seasons, the most for an NFL quarterback. His first 20 seasons were with the Patriots, which is also the 
Title: Tom Brady
Content:  for an NFL quarterback with one franchise. He has served as the primary starter in 20 of his seasons, holding a backup role during his rookie campaign and missing nearly all the 2008 season due to a knee injury. The 2008 season marks the only time that Brady did not start because of injury. Brady has never had a losing season as the starter and only missed the playoffs in 2002, the first year he started all 16 regular season games. With the Patriots, Brady led the team to 17 AFC East titles. His 18th postseason appearance with the Tampa Bay Buccaneers in 2020 was 
Title: Tom Brady
Content:  former backup Matt Cassel, who then played for the Kansas City Chiefs) after undergoing surgery for a stress fracture in his right foot dating back to 2008. Brady was also the only unanimous selection for the AP All-Pro Team and was named the 2010 AP NFL Offensive Player of the Year. By unanimous decision, he won the MVP award for the second time in his career. On the inaugural NFL Top 100 Players list, Brady was ranked as the best player in the NFL by his peers. After earning the #1 seed and a bye week, the Patriots lost to the New York Jets in the Divisional Round, 28–21. Brady finished the game 29-of-45 for 299 yards, two touchdowns, and one interception which ended his NFL record of consecutive pass attempts without an interception at 340.
Title: Tom Brady
Content:  his high school football career by completing 236 of 447 passes for 3,702 yards and 31 touchdowns. He also won All-State and All-Far West honors and the team's Most Valuable Player Award. During summer break of 1998 and 1999, Brady was an intern at Merrill Lynch. He was inducted into the Junípero Serra High School Hall of Fame in 2003, joining fellow Serra High graduates Barry Bonds, Lynn Swann, Gregg Jefferies, and Jim Fregosi, among many others. When Brady visited the school in 2012, two weeks after Super Bowl XLVI, administrators announced that they named the football stadium Brady Family Stadium.
Title: Tom Brady
Content:  Super Bowl XXXVI. As the team's primary starter for 18 seasons, Brady led the Patriots to 17 division titles (including 11 consecutive from 2009 to 2019), 13 AFC Championship Games (including eight consecutive from 2011 to 2018), nine Super Bowl appearances, and six Super Bowl titles, all NFL records for a player and franchise. He joined the Buccaneers in 2020 and led them to win Super Bowl LV, extending his individual records to 10 Super Bowl appearances and seven victories. Brady holds many career quarterback records, including passing yards, completions, touchdown passes, and games started, in addition to the most Pro Bowl selections. Never having a losing season, he is the NFL leader in 
Title: Tom Brady
Content:  passing yards, making him the oldest player ever to lead the league in passing yards. He was named a first-team All-Pro by the Associated Press for the third time in his career. Earning 40 of 50 votes, Brady was named the NFL Most Valuable Player for the third time in his career. For the second straight year and third time overall, Brady was ranked No. 1 by his fellow players on the NFL Top 100 Players of 2018. Brady and the Patriots began their postseason run by defeating the Tennessee Titans, 35–14, in the Divisional Round of the playoffs. With the win, the Patriots advanced to the AFC Championship Game for the seventh straight year. 

Question: how long has tom brady been playing professional football?
Answer: 18-season career.