Trent Williams, who missed the final seven games last season with heel and ankle injuries, is healthy, in shape and "right where he needs to be," according to head coach Kyle Shanahan.

Left tackle Trent Williams, a month shy of 37, is healthy and still determined to play into his 40s, as evident by him participating in the 49ers’ minicamp.

For now, San Francisco 49ers offensive tackle Trent Williams doesn't know when he's going to retire, and he pretty much plans to keep playing until the wheels fall off.