Grijze haren professor geeuwen in lege collegezaal - Stockfoto’s en -afbeeldingen

Grey hair professor sitting in empty lecture room and looking at laptop

Grey hair professor talking by smartphone and looking at laptop

Smiling grey hair professor sitting in empty lecture room and talking by smartphone

Grey hair professor looking at laptop

Grey hair professor working with laptop

Smiling grey hair professor sitting in empty lecture room with laptop

Grey hair professor stretching in empty lecture room

Smiling grey hair professor sitting on desk in empty lecture room and talking by smartphone

Grey hair professor sitting in empty lecture room with crossed arms

Side view of handsome grey hair man using laptop at home

Adult son using laptop and senior father reading business newspaper at home

Happy adult son and senior father looking at old photos at home

Handsome grey hair man sitting at table and looking at photos at home

Cropped image of grey hair man using laptop at home

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

Cropped image of grey hair man using laptop on sofa at home

Serious senior man writing in notebook with pencil