書籍のスタックを保持している白髪教授 - ストックフォト＆画像

Grey hair professor pointing on something at blackboard

Grey hair professor pointing on something at lecture hall

Cropped image of senior lecturer holding book and showing one finger up

Smiling grey hair professor holding paper plane in lecture room

Grey hair professor pointing on something at blackboard

Senior lecturer holding piece of chalk and looking away

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

Senior lecturer pointing on something in lecture room

Close-up portrait of senior man reading book

Thoughtful senior writer sitting at workplace and looking away isolated on black

Smiling senior man looking at camera while touching jacket isolated on grey

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

Cropped shot of senior man with pencil and sheet of paper

Handsome grey hair man holding book and looking at camera at home

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

Excited senior man in headphones waving hand at smartphone on chair on grey background

Elderly man in bow tie and blue jacket using smartphone isolated on grey

Collage of senior man smiling while talking on smartphone on grey background

Senior man using headphones and smartphone on chair on grey background