I don't want to stay in academia after finishing my PhD. My current research field is not exciting to me anymore, but also I am too old to change fields. Although my research and my interest were so far quite theoretically focussed, I would like to find a more applied job in R&D in a big prestigeous company, helping improving future technologies.
Now: How do I tell my supervisor? I want to avoid leaving the impression I think our research field is boring. My supervisor tries already finding Postdoc positions for me, and probably thinks I'm quite qualified for staying in academia. So I fear to be disappointing.