Miller, who turns 37 two days before Christmas, volleyed home his landmark strike to hand the Ibrox side a 1-0 victory over Inverness in the Highlands.
And his manager reckons his professional approach could see him emulate assistant boss David Weir, who was 41 before he hung up his boots.
Warburton said: "It was a tremendous finish from Kenny.
"How Kenny trains, how he conducts himself, how he looks after himself, his mentoring role with the younger players on and off the pitch and the respect he has in the dressing room is all very important.
"With people like Kenny, like Lee Wallace, like Niko Kranjcar, they have an important role to play. Kenny knows what we think of him, his contribution, another 90 minutes tonight, tells you all you need to know.
"How long can he keep going? Ask Davie Weir. He looks after himself very well. He deserves to keep going."