Magnolia tree

My grandmother planted me when I was young, 
I could hear the windchimes when they rung
Now it is August, my flowers start to bloom
It is cold and miserable but people still swoon
I am 20 years old by now, with my grandmother gone, 
I am losing my flowers, and I haven't grown a thorn
I am 40 years old by now, yet people no longer swoon
I have gone through all the seasons a hundred times too soon
I am 60 years old by now, people moved in beside me,
Unlike my grandmother, they don't want to sit alongside me
I am 100 years old by now, the kids that used to climb me
are all grown up and moved out of their houses in spite of me
I am a magnolia tree, big and green, I loved my grandmother,
she loved me, now the people beside me are just mean