Serious professor education and knowledge concept elderly professor teacher on blackboard senior pro

Related tags:

• teacher teaching
• teaching
• school teacher
• lesson
• class
• classroom
• professor
• educational
• study
• learning
• teacher
• blackboard
• exam
• university
• school
• book
• mature
• write
• face
• face portrait
• portrait
• face model
• model
• lecture
• senior
• 19+