My Grandmother

My grandmother is 103 years old this year but she has gone for couple weeks ago.
In my memory, she walked with my grandfather along train track to my house when I was a child. Her kindly face was always in my mind. The time was so fast, and then passed more 30 years. However, I already lose her face in my mind even I would see her one time per year. I heard she had gone in the phone in couple week ago. Her face always was repeated in my brain. She had nine children so I have four uncles and five aunt and they still are alive now excepting one of aunt gone couple years ago. It seems her family has long-lived gene because first aunt is 80 years old and last uncle is 60 years old. Why do they have long-lived gene? I think they lived in good place and they have regularity activity in the country.