Authors:

You are as young as your faith, as old as your doubt; as young as your self-confidence, as old as your fear, as young as your hope, as old as your despair.

"The Silver Treasury, Prose and Verse for Every Mood" by Jane Manner, (p. 323-24), 1934.
You are as young as your faith, as old as your doubt; as young as your self-confidence, as old as your fear, as young as your hope, as old as your despair.