The definition of beauty has been changing a lot all the time. Because the definition of beauty never exists alone, it is related to history, culture and the society development level.
With the development of society, and more people get the opportunity of education, I think I increasingly agree with the current mainstream aesthetic.
That is the tolerance to multiple definition of beauty.
Beauty can be everything, everyone has his or her thoughts about what is beauty, and this can be supported and accepted.
Beauty can be inter beauty, when someone has a beautiful heart, he or she can be regarded possessing beauty.