If it is mentioned to have a better quality of life, it probably means that the physical and social health mental emotional and spiritual environment that can be measured from 3 elements are also healthy.
If we discuss the quality of life. It means to have a physical, mental, social, emotional and spiritual environment. Can be measured by three components: a healthy age.
If they mention having a good quality of life. It means a healthy physical, mental, social, emotional, and spiritual environment good, can measure from the 3 elements is healthy for her age.