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.

SANTA CLARA (AP) — As Trent Williams closes in on his 37th birthday next month, he’s not quite ready to think about when his brilliant football career will come to an end.