Old People

"Old people" who have learned to be content in any state of existence because of their confident trust in Jesus Christ their Lord are described right here:

The [uncompromisingly] righteous shall flourish like the palm tree [be long-lived, stately, useful, and fruitful]; they shall grow like a cedar in Lebanon [majestic, stable, durable, and incorruptible]. 

Planted in the house of the Lord, they shall flourish in the courts of our God.

[Growing in grace] they shall still bring forth fruit in old age; they shall be full of sap [of spiritual vitality] and [rich in the] verdure [of trust, love, and contentment].

[They are living memorials] to show that the Lord is upright and faithful to His promises.
Psalm 92:12-15 Amplified (Classic)

It's likely that you know a handful of people fitting this description.

It's God's intention for you to be the same way.