Professore di capelli grigi in piedi in aula e guardando la macchina fotografica - Foto e immagini stock

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

Grey hair professor pointing on something at blackboard

Grey hair professor pointing on something at blackboard

Talking to students or pupils. Senior school teacher concept. Honored professor. Teacher bearded man tell cheerful story. Teacher charismatic grandpa sit at table classroom chalkboard background.

Smiling grey hair professor holding paper plane in lecture room

Process for each solution. bearded lecturer man explain geometry. back to school. Math graphic tools. trigonometry lesson in classroom. get knowledge here. senior man teacher use math tools.

Classic subjects learning. Improve teaching skills. Mature pedagogue. Teaching has changed in last years. Man bearded tutor in classroom. Teaching is passion. Main task in teaching. Formal education.

Grey hair professor holding stack of books

Honored professor. Teacher bearded man tell cheerful story. Teacher charismatic grandpa sit at table classroom chalkboard background. Talking to students or pupils. Senior school teacher concept.

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

Close-up portrait of senior man reading book

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Smiling elderly man with hand in pocket of pants talking on smartphone on grey background

Collage of senior man smiling while talking on smartphone on grey background

Senior man using headphones and smartphone on chair on grey background

Collage of smiling and excited elderly man touching jacket on grey background

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

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

Elderly man in jacket showing digital tablet with blank screen on grey background

Senior man smoking cigar and drinking whiskey in armchair

Senior man looking at camera while touching jacket on grey background