Wizard Ages, Physical vs. Real

[Dave Hardenbrook]

No: HPFGUIDX 169806

I've been thinking about how Wizards live longer than Muggles, and
how, at least in Jo's own depictions, people such as McGonnegal and
Hagrid look somewhat younger than they would if they were Muggles.
This has led me to use a bit of speculation and elementary Calculus
to derive a formula for how old a Witch or Wizard should appear
physically, based on their real age.  The equation I derived is:


                 Ac^2
Ap  =  Ac  -  ---------
                 400

Where:
      Ac = Chronological (Real) Age
      Ap = Physical Age (Compared to Muggles)


Applying this formula we get the following physical ages for leading
characters.  Ages given are as of the start of DH according to
HP-Lexicon, except "Harry at Godric's Hollow", and Dumbledore,
Slughorn, and Madame Marchbanks, whose approximate ages at the time
of HBP are given:
      
Harry at GH (1):   Appears 1
Ginny (16):        Appears 15
H, R & H (17):     Appear  16
Bill (27):         Appears 25
Snape (39):        Appears 35
L. Malfoy (43):    Appears 38
Hagrid (69):       Appears 57
McGonnegal (72):   Appears 59
Slughorn (100?):   Appears 75
Dumbledore (157?): Appeared 95 (at death)
Mme. Marchbanks (200?): Appears 100

This adjustment seems to agree with visual depictions of the
characters and the increased longevity of Wizards, and is helpful, to me
at least, in visualizing certain characters not often depicted.

Comments welcome.

Dave