18 Though while they live they count themselves blessed— and people praise you when you prosper—

Read Psalm 49:18 Using Other Translations

Though while he lived he blessed his soul: and men will praise thee, when thou doest well to thyself.
For though, while he lives, he counts himself blessed --and though you get praise when you do well for yourself--
In this life they consider themselves fortunate and are applauded for their success.