“Harry, I owe you an explanation. An explanation of an old man’s mistakes. For I see now that what I have done, and not done, with regard to you, bears all the hallmarks of the failings of age. Youth cannot know how age thinks and feels. But old men are guilty if they forget what it was to be young … and I seem to have forgotten, lately …”

Dumbledore, Order of the Phoenix, Ch. 37