Mary, a green aura means you are rich beyond imagination. Just kidding. A
green aura is often associated with stability and a generous nature. If
the green is bright, the person is very healthy.
Auras change with your health and emotional state, not necessarily with age in and of itself. I was in the home of a lady and noted her aura was muddy looking around her knees, it turned out she had fallen on her knees and, though not broken, they were badly bruised and she was walking with considerable pain. The aura is a dead giveaway for pain.