Possible Clues:

• Retired-but-still-around types
• Retired honorary professors
• I bore myself standing for those having left office
• Old academic titles
• Term used to designate retired professors
• Honorary professors - ie retired but retaining integrity
• Such as retired professors who retain title
• (Of, say, professors) retired, but retaining title
• Some former lecturers
• Those honourably discharged from public duties