Magic late in life

[Lana]

No: HPFGUIDX 161782

JKR has said, "There is a character who does manage, in desperate circumstances, to do magic quite late in life, but that is very rare..."

    I am wondering if this doesn't pertain to Filtch.. I had thought that maybe it woud be Dudley, but JKR also said that Dudley is "just Dudley" so she killed that thought.  
    Then I thought of Petunia..  We know we will find out more and that it isn't a squib issue.  Has JKR ever stated that Petunia was definately not magical?
   Perhaps it will be Uncle Vernon?  
  Any thoughts?
 Lana


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