@Letty,
I don't think any of us know Sybil Gardner. As I've pointed out, quite a few times now, I'm writing out the pages of a book I bought at a car boot sale. The book it called Shakespeare Birthday Book, and there is a Shakespeare quotation for every day of the week, plus a space to write in birthdays. These birthdays obviously meant something to the book's original owner, (one Audrey Athey, probably long dead,) but I wouldn't expect them to mean anything to the rest of us.
After googling it, I found it was published in 1910, and judging on the handwriting I would estimate Audrey was somewhere between 8 and 12 when she got it, which, were she still alive today, would make her at least 116 years old.
I'm just posting the birthdays of long dead friends/relatives of a long dead girl, just to give a sense of the history of unknown people. If you find it a bit too much I can always stop.