Lachende grijze haren professor zittend op tafel met laptop - Stockfoto’s en -afbeeldingen

Smiling grey hair professor holding piece of chalk

Senior lecturer holding piece of chalk and looking away

Grey hair professor pointing on something at blackboard

Grey hair professor pointing on something at lecture hall

Side view of grey hair professor correcting something at blackboard

Senior lecturer leaning on table and looking away

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

Smiling grey hair professor holding wooden pointer

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

Grey haired man in shirt and jacket smiling at camera while holding laptop isolated on grey

Handsome grey hair man taking selfie with smartphone in kitchen

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

Portrait of smiling grey hair man looking at camera at home

Smiling senior man holding digital tablet with blank screen isolated on grey

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

Pensive handsome grey hair man holding book and looking at camera