In the Poem Teenagers by Pat Mora, How does this poem describe the relationship between teenagers and adults?

Poem:

"One day they disappea rinto their rooms.Doors and lips shut,and we become strangers in our own home.I pace the hall, hear whispers,a code I knew but can’t remember,mouthed by mouths I taught to speak.Years later the door opens.I see faces I once held,open as sunflowers in my hands. I see familiar skin now stretched on long bodies that move past me glowing almost like pearls."