Lachende grijze haren professor in lege collegezaal zitten en praten door smartphone - Stockfoto’s en -afbeeldingen

Grey hair professor talking by smartphone and looking at laptop

Smiling grey hair professor sitting in empty lecture room with laptop

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

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

Grey hair professor stretching in empty lecture room

Grey hair professor yawning in empty lecture room

Grey hair professor looking at laptop

Grey hair professor holding eyeglasses and looking at camera

Smiling handsome grey hair man talking by smartphone at table with laptop

Smiling handsome grey hair man talking by smartphone and holding laptop at home

Handsome senior writer working with laptop and making notes in notebook

Cropped image of grey hair man using laptop at home

Side view of handsome grey hair man using laptop at home

Adult son using tablet and senior father using laptop at home

Senior man in tweed suit writing letter in front of white brick wall

Serious senior man writing in notebook with pencil