[Facts] Re: Nobusuke (Japanese masculine name)
I agree with everything ClaudiaS said, but adding to that, Nobusuke is a very traditional and masculine sounding name (particularly the -suke part), it's not trendy these days but I wouldn't necessarily call it "old-fashioned".
Perhaps you've gotten 'nobu' mixed up with 'kobun', which is how the yakuza address their proteges/apprentices. The usual way to address a professor or master of a craft is 'sensei', or 'hakase' for PhD's. To address an elderly man you'd say something like 'ojii-san', which literally means grandfather.