Wizard's Age

[profusepersiflage at yahoo.com]

No: HPFGUIDX 24267

   J.K. Rowling said in an interview that Dumbledore is approximately 
150 years old and that, contrary to my pet suspicion that he has 
secretly stowed away some of the Elixir of Life, it is natural for a 
wizard/witch to live somewhat longer than the average muggle. 
However, the mysterious aging process of witches and wizards is a bit 
confusing. In The Chamber of Secrets when Harry looks into Riddle's 
diary and sees Dumbledore as he was 50 years ago he, as would be 
expected, looked much younger and didn't yet have white hair. 
Dumbledore was about 100 years old at the time. So when did he start 
aging slowly? Harry and his peers are described as being 14 years 
old, both physically and mentally, when they ARE 14 years old. 
Therefore, we know that witches and wizards age normally for at least 
part of there lives. Do they have random intervals of suspended aging 
after they hit,say, 20? Or do they simply age slower after they reach 
a certain age? Is it the same for each wizard/witch? Dose it depend 
on an emotional or mental stage in someone's life rather than 
physical?
-Persi
Thou hast no youth nor age;
But, as it were, an after-dinner's sleep... ;)