Though Bryce Harper recently turned 23 years old, he is just months away from beginning his fifth season in the major leagues.
This may have been a disappointing season for the Nationals as a whole, but for a few individuals it was anything but.
Age on Opening Day 2016: 36
How acquired: Free agent, Dec. 2010
MLB service time: 12 years, 102 days
The 2015 season was a massive disappointment for the Nationals, who fell short of the playoffs and a World Series title they were expected to compete for.