Smiling grey hair professor holding stack of books with apple on top - Stock Photo & Image

Senior lecturer holding piece of chalk and looking away

Smiling grey hair professor holding piece of chalk

Grey hair professor pointing on something at lecture hall

Happy senior lecturer buttoning shirt

Senior lecturer leaning on table and looking away

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

Grey hair professor pointing on something at blackboard

Senior lecturer pointing on something in lecture room

Smiling senior man in shirt and jacket pulling hand at camera on blurred foreground isolated on grey

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

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

Positive senior man in blue jacket and bow tie touching eyeglasses isolated on grey

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

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

Confused senior man showing dubium gesture while looking at camera isolated on grey

Smiling senior man holding medical mask isolated on grey