I don't say this much, but hopefully, she has memory loss.

Well, you might learn some good old ways :)

what how did that happen?

Sneak her some diuretics on the day you need to go on the date; she'll be stranded.

Make it a double date. And please explain what happened.

well hopefully she tells stories, older people always have the best stories LOL especially about the "good ol' days"

A geriatric chaperone? Good luck living it down, OP.

Have a fake date. She won't know the difference and a friend gets free food? :)

Depending on your date it might turn out for the better, it will surely be a date both of you will remember.

What was the bet? Oh and I'd love to hear how that date of yours turns out. I imagine it would be interesting :)