I am of the nature to grow old. There is no way to escape growing old.
I am of the nature to have ill health. There is no way to escape ill health.
I am of the nature to die. There is no way to escape death.
All that is dear to me and everyone I love are of the nature to change. There is no way to escape being separated from them.
My actions are my only true belongings. I cannot escape the consequences of my actions. My actions are the ground upon which I stand.
A version of the Buddha's Five Remembrances, offered by Thich Nhat Hanh in The Plum Village Chanting Book (Parallax Press, 1991).
To read more about change and dealing with it, take a look at this article in Yoga Journal.