guess how old I am.

Older than Juliet

Hmmm, definitely pre-Shakespearian - 16th C?...
Younger than Joan of Arc (just)
...15th C...
Same age as Ophelia ( If you take the top end of the estimate)
...Shakespearian at the latest - 17th C

That would make you about 400 years old.

By 'eck, you are a baby round here, dode.