Gwen Tennyson, Professor Paradox and others in “Paradox”

Those trails. They're not burned marks, they're age. The creature accelerates time!

Very good!

[charging at the trans-dimensional creature] Not so fast, ugly! [punches the creature, but it causes his hand to wrinkle and ages forward into an old man]

[gasps] Kevin!

Kevin!

[reverting back] Just touching that thing aged him, 60, 80 years? We've got to get him to a hospital.

What are you doing? Get your hands off me.

Come on, Kevin, we're going to get you some help.

What do you mean, "help?" I'm gonna kick that thing's keister! [kicks his foot and his back spine pops] Oy!

Are you okay?

My back is killing me, my legs ache, and what's up with these shoes? Is it too much to ask for a little support?

He's like a real irritable, short-tempered, crotchety old man.

Why are you whispering?

In other words, aside from the male-pattern baldness, he's pretty much the same as always. Come on, old man. I'll take those. [takes the car keys out of Old Kevin's hand as he's trying to insert them into something]

What do you think you're doing?

Driving.

Don't even think about it, you don't have a license.

Grandpa Max taught me, and it's an emergency. You're nearsighted, arthritic, your reflexes are shot, and you're trying to unlock a cactus.

[sitting in the backseat; to Gwen] You should've gone out with me when I was young and handsome.

You were too immature.

What about now?

Too old.

[backs up and accidentally bumps into some trash cans; embarrassingly] Whoops! (My bad.)

It's not a bumper car!