The sextile brings ease to that area of the chart, along with helpful people. Not quite as powerful as the trine, the other positive aspect. It is the weakest of the five major aspects (conjunction, opposition, trine, square, and sextile), but it still enhances the planets involved somewhat, compared to what their importance would be without that aspect. The closer the sextile is to 60°, the stronger the aspect is, and the more it enhances the planets involved.
Sextiles in a birth chart never change. They show characteristics that you are born with and will keep all through your life. Pay attention to what Houses they are in. That shows in what area of your life the sextiles mostly express themselves.
Also, consider how long the sextile lasted in the sky, at the time of your birth: Some come and go very quickly, so they are quite personal, whereas others (those of the outer planets) remain for years, so they are shared by a whole generation.
What are some of your favorite things about you? Is there a sextile in your chart that helps this trait? Take a look and see what you find!