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.

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.

Trent Williams was a full participant in Tuesday's mandatory minicamp. Williams soon turns 37, but he is still going strong as he prepares for his sixth season in San Francisco. "I just feel like I do myself and my teammates a disservice if I'm looking toward the end,