Doesn't the scripture say that God alone is eternal?
I think that he is and if he alone is eternal than nothing else that scripture labels eternal can actually BE eternal
So many definition come into play here. For instance....
If eternal means always was and always will be then only God is eternal
If eternal means to live forever then a created being who is given or possesses unending life could be considered eternal.
Some people define eternal as forever, but without end doesnt necessarily mean eternal. Without beginning or end definitely does mean eternal- and that is God alone.
But the truth is, the words eternal and forever are a few steps of translation and interpretation out of "olam".
If we are using the first definition then I would say yes, only God is eternal, since He is the source of all things but He Himself has no source and therefore only He can be eternal, having always been, and enduring forever in the now, I AM THAT I AM.
Exo 15:18 The LORD(YHWH) shall reign for ever(olam olam H5769) and ever.H5703 ad)
Psa 10:16 The LORD(YHWH) is King for everH5769 and ever:H5703 (same)
This Psalm throws a monkey wrench in the gears
The king shall joy in thy strength, O LORD; and in thy salvation how greatly shall he rejoice! Thou hast given him his heart's desire, and hast not withholden the request of his lips. Selah. For thou preventest him with the blessings of goodness: thou settest a crown of pure gold on his head.
He asked life of thee, and thou gavest it him, even length of days for ever and ever. (Psa 21:1-4)
If olam olam means "age" or "world" and "ad" means either "eternity" or "terminus"(world without end, (age unending)
The righteous shall inherit the land, and dwell therein for ever.H5703 ad
(Psa 37:29)
Thy throne, O God, is for ever(H5769olam olam) and ever:(H5703 ad)the sceptre of thy kingdom is a right sceptre.
(Psa 45:6)
It seems that "ad" means "unending ending" or "the end that never ends" or "the end that goes on forever" HAHA
Olam definitely means "indefinite period of time" or "other world" as in "unknowable", "mist", so
The scriptures are no help HAHAHA (just kidding)
Actually I think the scriptures are great help and prove out through usage that "context is everything" even in the Hebrew and Greek.
Some boldly proclaim that "ad" means eternal but the scriptures destroy us again in context in Job
Job 20:4 Knowest thou not this of old,(H5703 ad) since man was placed upon earth,......
Since it says clearly "ad", SINCE MAN WAS PLACED ON EARTH.....DOH!

, our first definition of eternal(without beginning or end) only works when "ad" is conjoined with GOD.... proving my theory that words like "olam" and "ad" are defined by the subjects they are joined with, not by absolute independent definition.
Therefore, like the relentless pencil head I am I declare again that "aion" and "aionios" and "aidos" are only transliterations into Greek from "olam" and "ad"
YHWH means I AM THAT I AM or "SELF EXISTENT ONE". When olam olam ad are joined to YHWH....
יהוה מלך עולם ועד אבדו גוים מארצו׃ Psa 10:16 reading left to right, "
YHWH MELEK OLAM OLAM AD ABAD GOY GOY ERETS
Jehovah reigns ages unending undone peoples earth
or to paraphrase
Yahweh reigns forever, world without end- the nations perish and are undone.
In context the psalmist is comparing the eternal omnipotence of the Self Existent One with the nations that are like grass before the wind in comparison, in order to encourage the Israelites to trust and obey Him and not fear emulate their enemies, the heathen.
The king's daughter is all glorious within: her clothing is of wrought gold. She shall be brought unto the king in raiment of needlework: the virgins her companions that follow her shall be brought unto thee. With gladness and rejoicing shall they be brought: they shall enter into the king's palace. Instead of thy fathers shall be thy children, whom thou mayest make princes in all the earth.
I will make thy name to be remembered in all generations: therefore shall the people praise thee for ever and ever.(olam olam ad) (Psa 45:13-17)
This seems to be a Messianic prophecy, for only the name of Jesus will be made a name worthy of unending praise(Phil 2:10, therefore He has given Him the name above every name that at the name of Jesus........)
Psa 48:14 For this God(H430 Elohiym) is our GodH430 for ever and ever(olam olam ad): he will be our guide even unto(H5921 al- through, beyond) death.
In this verse our friendly KJV translaters translated ad as everlasting once and perpetual once- also translating olam olam into everlasting.
Hab 3:6 He stood, and measured the earth: he beheld, and drove asunder the nations; and the everlasting(olam olam) mountains were scattered, the perpetual(H5769 ad)hills did bow: his ways are everlasting.(olam olam)