I'll pitch in with 2 responses that I use - either / or / sometimes both:
I am! How do you think I got soooooo old? What do you think I saw / did when I was young? Do you know anyone else as old as me?
Shall I tell you something? (act like it's a secret) Some people don't like to be called old - even if they are!! So you can call me and grampy old - but can you be careful with other people?
Have you ever been to see a Spiritualist


