"I know, older women always swipe right for my youthful looks"
Or: "Damn 31... I'm nicknaming you 'wrinkles'"
Or: "Yup, I might make you insecure about your wrinkles"
The humor just doesn't make sense and it isn't the right way to go about addressing her concern. You might even offend her lmao. Just a simple “Age is just a number. I’ve dated women from early 20's to late 30's. It always came down to the person, not the year on their drivers' license." Like Mena said.
It's not a concern, she swiped right. If it was a real concern she wouldn't have swiped right. It's a shit test, and if you treat it like a concern it'll seem like you're butthurt.
I'm teasing her, it's playful, challenging, and non offensive. It communicates I don't care what she thinks, it doesn't move me, and I actually FLIP THE SCRIPT, making it into a problem for HER not for me.