The definition of beauty has been constantly changing. Because the definition of beauty never exists on it's own/in isolation/ alone, it is related to history, culture and the level of social development.
With the development of society, and more people getting the opportunity for education, I think I increasingly agree with the current mainstream aesthetic, namely
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 inner beauty, when someone has a beautiful heart, he or she can be regarded as possessing beauty.