Robert "The Chief" Parish has the longest active NBA career with 11,611 games played over 21 seasons. Darrell Green who played 20 seasons from 1983-2002 with the Redskins.
Shaq
Robert Parish
Robert PArish played 21 seasons, longest in the NBA.
Robert Parish
shaq
morten Anderson nfl from 86 to 08
This is a very broad question. You might want to ask who had the longest career in NBA, MLB, MLS, NFL, and NHL ext. This will tell you who had the longest career in each sport and you will then be able to see who had the longest career or ( in your words) who played sports the longest.
Spurs
Clippers
jeremy lin
Lakers is the longest that still exists but they were at Minneapolis. the longest in the current city today is Celtics.
John Stockton - 19 years with Utah Jazz