Updated MAR 17, 2015 4:46p ET  Chris Borland's career lasted all of 14 games -- and less than 12 months. But, in the wake of Borland on Monday adding his name to the growing list of NFL players to retire surprisingly young, it's clear the 24-year-old's career (and his decision to end it) left quite an impact on many players -- current and former.  Pleasure playing with you Chris Borland @UWBadgers and against you for the @49ers Praying for you. #OnWisconsin  I understand but still shocked ((Chris Borland)) #49ers  WOW. I loved Chris Borland's game but I can't fault him for calling it quits. His concerns are real. Still it takes a man to do the logical.  I don't feel bad for Borland. I feel happy for him. He's made a tough choice.  The small number of ppl in my mentions that are irritated, spiteful of Borland's move need to be reminded that they don't own pro athletes.  Got to respect Borland for clearly putting thought into his decision. If you're not 100% committed to this game, better to walk away.  Borland reportedly retired over concerns of one day suffering a long-term brain injury. His retirement marks the fifth surprising, high-profile retirement in recent weeks, joining the likes of teammate Patrick Willis, former Titans quarterback Jake Locker and former Steelers linebacker Jason Worilds. At 30, Willis is the oldest of that group.  Here's the view from some who already called it a career:  Chris Borland retires at age 24...the NFLs worst nightmare is on the front doorstep...who will play in 25 years? http://t.co/a34PAf7nN6  49ers young star Chris Borland's retirement after one season is the beginning of many more to come. Best wishes, kid! http://t.co/SxTwvrCPL6  Players today are more concerned now than ever before regarding brain trauma and health issues. It's scary!  It's unnerving to go through a season & witness multiple players knocked unconscious. The body is not meant to sustain that type of trauma.  It's extremely difficult when you're living your dream of playing in the NFL as a 20-something to contemplate what life could be like at 50.
NFL world reacts responds to news Chris Borland is retiring at age 24, after 49ers linebacker led team in tackles his rookie season, reportedly over concerns of potential brain injury.