A Wizard's Age

[ladyramkin2000]

No: HPFGUIDX 86825

It is a given that the lives of witches and wizards are considerably 
longer than those of muggles.  I was wondering if someone born into a 
muggle family ,  who is offered a place at Hogwarts and, for some 
reason, refuses it, would still have an abnormally long life.  I 
think someone mentioned some time ago a theory that Petunia might 
have been offered a place and for some unknown reason, turned it 
down. Using her as an example, if she was really a witch, albeit an 
untrained one, would she have a very long life?  I am not, ofcourse, 
suggestingthat Petunia was a witch.  She is just a useful peg to hang 
the question on.
Sylvia (sorry this has come out rather jumbled, but I have been 
looking after a two-year-old all day.)