Šedivé vlasy profesor směřující na něčem na tabuli s dřevěnými ukazatel - Stock fotografie a obrázky

Grey hair professor pointing on something at blackboard

Grey hair professor pointing on something at blackboard

Grey hair professor pointing on something at lecture hall

Smiling grey hair professor holding paper plane in lecture room

Elderly teacher. Funny professor or scientist in a elegant suit. Copy space on chalkboard, blackboard, banner

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

Mature teacher enjoying job. Sharing knowledge. More tools introduced into everyday classrooms. Senior man teacher at chalkboard. Back to school. Teacher old school generation. Experienced lecturer.

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

Smiling elderly man in eyeglasses and bow tie looking at camera isolated on grey

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

Thoughtful senior writer sitting at workplace and looking away isolated on black

Excited senior man in bow tie pointing with fingers at camera isolated on grey

Excited senior man in headphones waving hand at smartphone on chair on grey background

Cropped shot of senior man with pencil and sheet of paper

Senior man smiling at camera while showing thumb up gesture and holding blue jacket isolated on grey

Serious senior man in tweed suit and glasses looking at camera

Senior man smoking cigar and drinking whiskey in armchair