Profesor siwe włosy, opierając się na stół i laską - Zdjęcie stockowe & obraz

Grey hair professor pointing on something at blackboard with wooden pointer

Grey hair professor standing near stack of books

Smiling grey hair professor standing with crossed arms

Elderly thinking teacher. People scientist occupation concept

Grey hair professor showing fist to students

Thoughtful senior lecturer sitting at table with pencil and notebook

Smiling grey hair professor holding wooden pointer

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

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

Happy senior man in sweater reading book

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

Thoughtful senior man sitting in armchair

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

Pensive senior man with grey hair standing with crossed arms at home

Upset elderly man in shirt holding photo frame in hands isolated on white

Upset elderly man in casual clothes standing with walking stick on white

Concentrated senior man in eyeglasses reading book

Senior man standing with hand in pocket and holding glasses

Handsome grey hair man sitting on sofa and holding book