Lächelnder grauhaariger Professor sitzt auf Tisch im Hörsaal - Stockfoto & -bild

Grey hair professor sitting on table in lecture room and holding book

Smiling grey hair professor standing in lecture room and looking at camera

Smiling senior lecturer standing in classroom and looking at camera

Grey hair professor pointing on something at lecture hall

Senior lecturer leaning on table and looking away

Grey hair professor looking at blackboard

Senior lecturer holding piece of chalk and looking away

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

Happy bearded speaker in glasses talking near microphones and brick wall

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

Handsome grey hair man sitting in armchair, holding old photos and looking away

Adult son and senior father sitting on sofa and looking at camera at home

Positive and bearded spiritual guru gesturing and looking at camera in park

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

Full length view of man in suit and eyeglasses sitting on high stool and reading newspaper on dark grey

Senior man smiling at camera while holding headphones isolated on grey

Elderly man in shirt and jacket using smartphone isolated on grey