Well, sometimes his eyes were kinda greyish blue so
How,, is this relevant to anything going on
Hol up y'all are forgetting about how it took them a number of years to get to Earth when they saw Holt's message, and how it took them forever on Earth to get ready and stuff for the battle against the Galra, and how they stayed out in space for a long time looking for Honerva, and the fact that Voltron ended in like January of 2018, which means Keith would've had a birthday by now.
So canonically, we still don't know, unless someone has enough time to do the research and math.
A l s o , Allura is his girlfriend, right? So he would rather Allura be in stuck with Bob for the rest of her life (again, his girlfriend, in case you need a reminder), over Keith? ok dreamworks