At age 35, is Anquan Boldin still part of 49ers' future?

Daily 49ers blog for NBC Bay Area website: Receiver Anquan Boldin has seen his production decrease for three straight years, yet was still the 49ers' best pass catcher in 2015. Will the free agent be retained, or allowed to walk? http://www.nbcbayarea.com/news/sports/At-Age-35-Does-Anquan-Boldin-Fit-in-With-49ers-Plans-366710591.html