The Chicago Bulls began the season with one of youngest starting lineups in the NBA, loading up their entire young core — when Lauri Markkanen is active — into the first unit to give the group an average age of 21.6. To close games down the stretch recently, however, coach Billy Donovan has relied on a group with more experience. To go with the backcourt of Coby White and Zach LaVine, Donovan has inserted veterans Otto Porter — who has been starting in place of Markkanen — Garrett Temple and Thaddeus Young to give the team a balance of youth and experience. That group helped close out another …
