I have calmed and quieted my soul,
like a weaned child with its mother;
like a weaned child is my soul within me.
O Israel, hope in the LORD
from this time forth and forevermore. —Psalm 131:2,3
No longer clambering, complaining, fretful, frustrated, angry and out of sorts, David was at rest, content to rely on God alone.
Aging is a little like weaning, in that we learn to disengage from childish necessities. We no longer have to be bigger than, stronger than, better than, smarter than everyone else in the room. We can just "be”— calm and quiet, content with God alone.
This is the secret of "good old age."