The future of Khalil Mack is one of the biggest questions facing the Los Angeles Chargers this offseason. Mack is set to hit free agency, and there is a very real possibility he could decide to retire rather than return for another season. Even if he doesn’t retire, there’s no guarantee he’ll be back in powder blue. At 35 years old, Mack still played at a high level, but the Chargers have to prepare for the possibility that his time with the team—and possibly in the NFL—is over.