Damn. That's a decent age difference. Very similar in my family. I have a 7 year old sister. Mine's a little larger.
...I'm going to be in my final year of uni when she does year 8. Wow. Haha. I'm gonna be there for 6 years too.
Mechanical engineering, eh? I want to ask if that's got anything to do with robots, but don't want to show extreme ignorance.