There could be various work options available for senior citizens even after retirement. Seniors have great experience which can benefit many. Listing some of the options here.

• Visiting Professor/Faculty
• Specific Courses on Online Learning Platforms like Udemy, Coursera etc.
• Teaching Specific Subjects to Students: Few subjects like Physics, Mathematics for higher classes are complex and many students find it tough and need regular coaching.

Superprof and Cuemath are some of the options to explore for teaching various subjects and hobbies online.