Uśmiechający się siwe włosy profesor gospodarstwa stos książek z apple na górze - Zdjęcie stockowe & obraz

Thoughtful senior lecturer sitting at table with pencil and notebook

Grey hair professor pointing on something at lecture hall

Exam in college. Bearded professor at school lesson at desks in classroom. Chalkboard copy space. Good tutors are often communication masters. Thank You Teacher

Smiling grey hair professor holding stack of books with apple on top

Happy senior lecturer buttoning shirt

Grey hair professor pointing on something at blackboard

Senior lecturer holding piece of chalk and looking away

Smiling grey hair professor holding piece of chalk

Positive senior man in blue jacket and bow tie touching eyeglasses isolated on grey

Smiling elderly man in eyeglasses and bow tie looking at camera isolated on grey

Positive senior man talking on smartphone and pointing with finger isolated on grey

Portrait of smiling grey hair man looking at camera at home

Senior man smiling at camera while showing thumb up gesture and holding blue jacket isolated on grey

Excited senior man in bow tie pointing with fingers at camera isolated on grey

Smiling senior man holding medical mask isolated on grey

Serious senior man in tweed suit and glasses looking at camera