The question: “Where do you see yourself in 5 years? ” does not make any sense.
I hope your offer is interesting enough so that my job description, 5 years from now, will include several tasks and competencies that do not even exist today.
And that is where I see myself in 5 years, in your company: Doing something that CAN’T BE DESCRIBED TODAY!
I am pretty sure, it will take less than two years anyway for the “never saw that coming” to emerge in the performance indicators.