Is it normal for someone privately selling a vehicle to ask for this information?

I have an appointment to go test drive the van that I am hopefully getting.
I just received an email from the gentleman selling it asking for my Full name, address, and date of birth. I am also bringing a friend with me to test drive it as I still only have a permit. He requested her full name, address, and her driver’s license number. Is that normal for a private seller to ask such things?