My old scooter, it’s been with me for 15 years now, and its registration lapsed back in 2014. Any idea how I can sell it? If selling it with expired registration is impossible, how can I get rid of it legally?

You cannot legally sell a scooter with an expired registration in India. To sell it, you need to renew the registration first. Alternatively, you can scrap the scooter officially through authorized agencies, which will involve a process of getting a certificate of destruction.