Yahoo Sports reports: San Francisco 49ers left tackle Trent Williams acknowledged that the contract he signed in April might be the last of his stellar career. Williams said he's committed to completing the two-year, $50 million contract that runs through the 2027 season but then said he would likely retire at age 39. Williams talked about wanting to spend more time with his children, saying his oldest daughter was born just a few months before he was drafted by Washington in 2010 and soon will be headed to college.