Lächelnder grauhaariger Professor blickt im Hörsaal auf sein Smartphone - Stockfoto & -bild

Senior lecturer holding book and pointing on something

Senior lecturer showing idea gesture

Thoughtful senior lecturer sitting at table with pencil and notebook

Smiling grey hair professor holding paper plane in lecture hall

Senior lecturer holding book and looking away

Grey hair professor talking by smartphone and looking at camera

Senior lecturer writing something on blackboard and showing one finger up

Grey hair professor using laptop at table in lecture hall

Cheerful businessman in glasses voting near brick wall

Pensive handsome grey hair man thinking and looking at chessboard at home

Excited senior man in bow tie and jacket holding smartphone isolated on grey

Thoughtful senior man with pencil and sheet of paper in front of white brick wall

Handsome grey hair man reading book at home

Smiling elderly man looking at camera while holding laptop isolated on grey

Portrait of smiling grey hair man looking at camera at home

Senior writer in tweed suit and eyeglasses with letter near workplace