But you, Frodo my lad - you seem older even than I, as young as you are, scarcely past fifty, and still carrying the weight of the world upon your shoulders even though our Ring is gone.

What a perfect line.

The second one is especially lovely. I like the parallels between the two stories - Frodo is worried for Pip and Bilbo for Frodo, but both of them regret the loss of their innocence. Nicely done!