Starszy wykładowca prowadzące księgę i wskazując na coś - Zdjęcie stockowe & obraz

Smiling grey hair professor holding paper plane in lecture hall

Thoughtful senior lecturer sitting at table with pencil and notebook

Smiling grey hair professor looking at smartphone in lecture room

Senior lecturer showing idea gesture

Senior lecturer writing something on blackboard and showing one finger up

Senior lecturer holding book and looking away

Senior lecturer holding book and looking away

Cheerful businessman in glasses voting near brick wall

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

Handsome grey hair man reading book at home

High angle view of handsome grey hair man reading business newspaper on sofa at home

Adult son and senior father gesturing while playing chess at home

Senior man in tweed suit reading notes in notebook with magnifying glass

Handsome grey hair man sitting on sofa and holding book

Serious senior man writing in notebook with pencil

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