Father Time still clearly can't quite win his battle with Tom Brady ... 'cause the NFL's GOAT just showed, once again, he's still ripped!!!
The 46-year-old popped his top for a workout down in Florida on Thursday ... and you can see the dude's still got chiseled abs, bulging biceps and a pair of defined pecs -- even though he hasn't played a down in the NFL in nearly two years.
It's apparent the muscles ain't just for show, too .