יהושע מאיר בת רחל שרה חיה
שרה לאה בת רבקה
עדינה בת שבע בת נעכא גיטל
Sometimes very holy people have to spend a lot of time taking care of their frail, weak, sickly bodies. This would seem to be a terrible yerida for them. Instead of being immersed in Torah and matters of the spirit they are instead involving themselves in their body, exercise, diet, etc. etc.
But this brings TREMENDOUS bracha to the world, for this way they elevate the world on the lowest level - the body, and thereby elevate the entire cosmos on every possible level.
That may be what the pasuk means -
עוד ינובון בשיבה דשנים ורעננים יהיו להגיד כי ישר ה' צורי ולא עולתה בו
They will still bring forth fruit in old age. They will be full of sap and green, to show that Hashem is upright. He is my rock, and there is no unrighteousness in him.
Their physical bodies will be full of sap and life and they will thus proclaim that Hashem is righteous because He enabled them to fix the world on the most basic level and shine the Divine light on even the lowest part of creation.