Lachende grijze haren professor zittend op een bureau in de kamer leeg Hoorcollege en praten door smartphone - Stockfoto’s en -afbeeldingen

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

Senior lecturer in empty lecture room screaming with hands up

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

Smiling grey hair professor sitting in empty lecture room

Smiling grey hair professor sitting in empty lecture room with laptop

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

Grey hair professor talking by smartphone and looking at laptop

Senior lecturer in empty lecture room screaming and looking at laptop

Happy senior man with mustache holding remote control and showing thumb up at home

Happy grey hair man watching on laptop at home and celebrate win a bet with a gambling, soccer bet, sports gambling

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

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

Smiling elderly man looking at camera while holding laptop isolated on grey

Handsome grey hair man reading business newspaper on sofa at home

Side view of handsome grey hair man using laptop at home

Bearded senior writer drinking coffee at workplace