How old was the youngest grandmother ever? I searched on Google and the answer I got was 17, which sounds way too young to me.
I found on google a grandmother that claims to be 16. this sounds unlikely.
You may want to search the Guinness world records site.
The youngest grandmother in the UK was 26 years of age, and this is reliable (article found in the bbc website.)
Other people asked questions on similar topics, check out the answers they received:
Other people asked questions on various topics, and are still waiting for answer. Would be great if you can take a sec and answer them