[joeysteele]

I am not sure only because of the student/teacher thing.

You cannot help you who fall in love with or become strongly attracted to, age is just a number, I am 20 but know people in their 40s and 50s who are far more young in outlook than some teenagers and 20+ year olds .

However, in this instance, a teacher does have to keep a distance from pupils,so maybe it's an unwise move as to that issue.
If they are happy,(also he has quit his job),plus it's their choice then no harm done really except to the family now broken up but often love or strrong attraction causes people to act in a throwing caution to the wind action.
Actions that may be massively regretted later on,especially if things go sour between these 2 in the near or distant future.