"I'm— you—" Your future son's brain is rebooting, please hold.

"Are you Howard Stark?" Tony finally manages to ask. First things first. He'll answer the other man's question once he figures out if he really is who he thinks he is. "Founder of Stark International? Or, uh, Stark Industries?"

It's possible this Howard is from a different universe as well as a different time— a fact that Tony is aware of, but for some reason doesn't find as weird as the time thing. Seeing a younger version of his dad like this is seriously freaky.