Abiding youths shall go round them carrying.
Serving them will be immortal servants.
(and there) shall wait on them immortal youth
Round about them will go youths never altering in age
Immortal/eternal children/boys circle/walk around on them
They will be properly served by…
Surrounded by immortal boys
There will wait on them youths who will not age
The serving youths, rapt always in the same state of being, will go round them
(Their) young sons will go round about them, who will remain as young as ever
They will be served by immortal boys