So that would make Dave an unknown amount of time older since Davesprie had been time traveling for half a year, correct?

Davesprite was in the doomed timeline for approximately a month and didn’t do much time traveling.

During the time of the Beta Kid’s session Dave said that he had been time traveling and it had been a few days from his perspective so he is only a handful of days older than Rose and Jade now.

~Mod T