Who came to magic late in life?

[muscatel1988]

No: HPFGUIDX 172352

--- In HPforGrownups at yahoogroups.com, "Tonya Minton" 
<tonyaminton at ...> wrote:
> Personally I think it is Neville who came in to magic later in 
life.
> Remember how his family didn't think he was magical enough to get 
into
> Hogwarts??  Remember how he was always melting cauldrons??  Then 
around the
> DA time he started doing really well.

I don't think it could be Neville:

"In my books, magic almost always shows itself in a person before 
age 11; however, there is a character who does manage in desperate 
circumstances to do magic quite late in life, but that is very rare 
in the world I am writing about." http://www.accio-
quote.org/articles/1999/0399-barnesandnoble.html

That also rules out another possible candidate, Ariana, as well, 
since she was only six (and the circumstances weren't desperate).  
The only other possibility that I can think of is Merope, who 
certainly does her most disastrous magic later, but I don't think 
there's any solid evidence other than her father's rantings that she 
is a squib.  I think it was a character, or character development, 
that was dropped.  We know that at least one other was dropped - 
Mafalda (Weasley?) was supposed to be in GoF, but didn't make it in 
the end. (http://www.jkrowling.com/textonly/en/extrastuff_view.cfm?
id=3), so not everything that was in play in 1999 made it all the 
way.

I think this is one thing we'll find out in later interviews - it's 
a common question on the www.  I was looking forward to it too, 
though.