"When someone dies they can be any age you remember can't the..." — Rosamund Lupton quote meaning

When someone dies they can be any age you remember can't they ' she asked. As I tried to think of a reply she continued 'You probably think about the grown-up Tess because you were still close to her. But when I woke up I thought of her when she was three wearing a fairy skirt I'd got her in the Woolworth's and a policeman's helmet. Her wand was a wooden spoon. On the bus yesterday I imagined holding her when she was two days old. I felt the warmth of her. I remembered all her fingers clasped around my finger so tiny they didn't even meet. I remembered the shape of her head and stroking the nape of her neck till she slept. I remembered her smell. She smelled of innocence. Other times she's thirteen and so pretty that I worry for her everytime I see a man look at her. All of those Tesses is my daughter.