Irrelevant you are the one who initially cited the LXX. Here is the definition of Olam from the Brown Driver Briggs Hebrew Lexicon, one of, if not, the most renowned Hebrew lexicons available. But you are welcome to believe anything you read on the internet.
עוֹלָם S5769, 5865 TWOT1631a GK6409, 6518439 n.m. long duration, antiquity, futurity;ע׳ Gn 9:12 + 405 times; עֹלָם 3:22 + 19 times; עֵילוֹם 2 Ch 33:7, read prob. עוֹלָם (for other explan. v. note in KitHpt); sf. עֹלָמוֹ Ec 12:5; pl. עוֹלָמִים Is 26:4 + 7 times, עֹלָמִים ψ 145:13 + 2 times; cstr. עוֹלְמֵי Is 45:17; 1. of past time: a. ancient time: יְמֵי ע׳ days of old Is 63:9, 11 Am 9:11 Mi 5:1; 7:14 Mal 3:4; יְמוֹת ע׳ Dt 32:7; עַם ע׳ Is 44:7 ancient people; גּוֹי מֵע׳ Je 5:15; חָרְבוֹת ע׳ old waste places Is 58:12 61:4, cf. Ez 26:20 b; פִּתְחֵי ע׳ ancient gates ψ 24:7, 9; ארח ע׳ Jb 22:15; נתבות ע׳ Je 6:16; שְׁבִילֵי ע׳ 18:15; גבול ע׳ Pr 22:28; 23:10; במות ע׳ Ez 36:2; מִן (םֵ
ע׳ from of old Is 64:3 Je 2:20 Jo 2:2, of the fathers Jos 24:2, the prophets Je 28:8, the ancient נפלים Gn 6:4; (Ez 32:27 G Co for מערלים; but 1 S 27:8 read מִטֵּלָם for מעולם We Dr HPS); בהם ע׳ long in them Is 64:4 (text dub.). b. מֵתֵי ע׳ the long dead ψ 143:3 La 3:6; so עַם ע׳ Ez 26:20. c. of God, מֵע׳: former acts Is 46:9; as redeemer Is 63:16; of love ψ 25:6, judgment 119:52, dominion Is 63:19; long silence 42:14; 57:11 G B Michaelis conj. מַעְלִם for מֵעוֹלָם; cf. I. [עָלַם] Hiph. ψ 10:1; his wisdom personif. Pr 8:23; his existence ψ 93:2. d. of things: גבעות ע׳ ancient hills Gn 49:26 (J), Hb 3:6 (|| הררי־עד
, Dt 33:15 (|| הררי קדם
. e. pl. שְׁנוֹת עולמים ψ 77:6 years of ancient times; דורות עולמים Is 51:9; לעלמים Ec 1:10 in olden times. 2. a. indef. futuring, c. prep.
for ever, always (sometimes = during the lifetime); עֶבֶד עולם slave for ever Dt 15:17 1 S 27:12 Jb 40:28; עָבַד לע׳ serve
for ever Ex 21:6 (E), Lv 25:46; עד ע׳ 1 S 1:22; גְּאֻלַּת ע׳ Lv 25:32 redemption at any time; הֲרַת ע׳ Je 20:17 ever pregnant (womb); כְּלִמַּת ע׳ v 11 of persecutors of Jeremiah; חרפת ע׳ 23:40; שַׁלְוֵי ע׳ ψ 73:12
alway at ease; יְחִי לע׳ (יחיה
may the king live
alway 1 K 1:31 Ne 2:3; cf. אֹרֶךְ יָמִים עולם ועד ψ 21:5; ישׁב עולם לפני אלהים 61:8; so of the pious, לע׳ לא ימוט 15:5; בל ימוט Pr 10:30, cf. ψ 30:7; other phr.: ψ 37:27, 28 41:13; 55:23; 61:8; 73:26; 121:8 Pr 10:25; ע׳ אשׁירה ψ 89:2 I will sing
for ever (as long as I live), cf. 52:10; 115:18; 145:1, 2; הוֹדה לע׳ 30:13; 44:9; 52:11; 79:13; other emotions and activities continuous through life 5:12; 31:2 = 71:1, 75:10; 86:12; 119:44, 93, 98, 111, 112 Mi 4:5, cf. לע׳ 2:9. b. = continuous existence, (1) of things: the earth, הָאָרֶץ לְעוֹלָם עֹמֶדֶת Ec 1:4; other phr.: ψ 78:69; 104:5, heavens and contents 148:6, ruined cities Is 25:2; 32:14 Ez 26:21; 27:36; 28:19, ruined lands Je 18:16; 25:9, 12; 49:13, 33; 51:26, 62 Ez 35:9 Zp 2:9; לעד עד ע׳ Is 30:8 for a witness
for ever, in a book; (2) of nations: לעולם אהיה 47:7 (Babylon loqu.), cf. ψ 81:16 Ob 10; ישׁב לע׳ of Judah Jo 4:20; (3) families ψ 49:12 Is 14:20; the dynasty of Saul 1 S 13:13; house of Eli 2:30; (4) national relations: איבת ע׳ continual enmity Ez 25:15; 35:5; of exclusion from קהל י׳, עד ע׳ Dt 23:4 = Ne 13:1; various relations Is 32:17; 34:10; חרפת ע׳
perpetual reproach ψ 78:66, of dynasty of David 2 S 3:28; 12:10 1 K 2:33, families v 33 2 K 5:27 ψ 106:31 Je 35:6. c.
of divine existence: אל עולם Gn 21:33 (J); אלהי ע׳ Is 40:28; חי אנכי לע׳ Dt 32:40; חֵי הע׳ Dn 12:7; of divine name, זה שׁמי לְע׳ Ex 3:15 (E), cf. 2 Ch 33:7 (v. supr.); blessing and praise of it 2 S 7:26 = 1 Ch 17:24, ψ 72:19; 135:13; of י׳ himself 89:53; attributes, אהבה Je 31:3 1 K 10:9; חסד Is 54:8 ψ 89:2; 138:8; לע׳ חַסְדּוֹ 1 Ch 16:34, 41 2 Ch 5:13; 7:3, 6; 20:21 Ezr 3:11 ψ 100:5; 106:1; 107:1; 118:1, 2, 3, 4, 29; 136:1 + 25 times, Je 33:11; כבוד ψ 104:31; אמת 117:2; 146:6; צדק 119:142; עצה 33:11; reign Ex 15:18 (E), ψ 10:16; 66:7; 92:9; 146:10 Je 10:10 Mi 4:7; יהוה לע׳ ישׁב ψ 9:8; 29:10; 102:13 La 5:19; presence in Zion 1 Ch 23:25 Is 33:14; 60:19, 20 Ez 37:28; 43:7, 9; his salvation Is 51:6, 8; זרעת ע׳ Dt 33:27
everlasting arms; כל אשׁר יעשׂה האלהים יהיה לע׳ Ec 3:14. d. of Gods covenant: בְּרִית ע׳
everlasting covenant Gn 9:16; 17:7, 13, 19 Ex 31:16 Lv 24:8 Nu 18:19 (all P), 2 S 23:5 1 Ch 16:17 = ψ 105:10, Is 24:5; 55:3; 61:8 Je 32:40; 50:5 Ez 16:60; 37:26; covenant with Noah, לְדֹרֹת ע׳ Gn 9:12 (P); God remembers it 1 Ch 16:15 = ψ 105:8, ψ 111:5; will not break it, לע׳ Ju 2:1; אוֹת ע׳ Ex 31:17 (P); אוֹת עד ע׳ Dt 28:46. e. of Gods laws: דבר(ים
Is 59:21 ψ 119:89; משׁפט 119:160; עדות v 144, 152; חק ע׳ Ex 29:28; 30:21 (E), Lv 6:11, 15; 7:34; 10:15; 24:9 Nu 18:8, 11, 19 (P), also Je 5:22 (of bounds of sea); חק עד ע׳ Ex 12:24 (J), חֻקַּת ע׳ v 14, 17; 27:21; 28:43; 29:9 Lv 3:17; 7:36; 10:9; 16:29, 31, 34; 17:7; 23:14, 21, 31, 41; 24:3, 8 Nu 10:8; 15:15; 18:23; 19:10, 21 (P) (most of these in fact specif. Jewish and temporary); temple to bear Gods name, עד ע׳ 1 K 9:3 = 2 Ch 7:16; לע׳ 2 K 21:7 2 Ch 33:4; consecrated לע׳ 30:8; its ceremonies לע׳ 2:3; Levit. priesthood, לשׁרתו עד ע׳ 1 Ch 15:2; Aaronic priesthood, לברך בשׁמי עד ע׳ 23:13(×2). f. of Gods promises: his word, יקום לע׳ Is 40:8; promised dynasty of David, עד (ה
ע׳ 2 S 7:13, 16(×2), 25 = 1 Ch 17:12, 14(×2), 23 ψ 18:51 = 2 S 22:51, 1 K 2:33, 45 1 Ch 22:10 ψ 89:5; לע׳ 1 K 9:5 1 Ch 28:4, 7 2 Ch 13:5 ψ 89:29, 37 2 S 7:29(×2) = 1 Ch 17:27(×2); of holy land 1 Ch 28:8, אֲחֻזַּת ע׳ Gn 17:8; 48:4 Lv 25:34 (P); given לע׳ Ex 32:13 (J) 2 Ch 20:7; עד ע׳ Gn 13:15, inherited לע׳ Is 60:21 ψ 37:18; עד ע׳ Is 34:17; dwelt in עד ע׳ Ez 37:25; other blessings, לע׳ Dt 5:29 Ho 2:21; עד ע׳ Dt 12:28 2 S 7:24 = 1 Ch 17:22, ψ 133:3; שִׂמְחַת ע׳ Is 35:10; 51:11; 61:7; דֶּרֶךְ ע׳ ψ 139:24; שׁם ע׳ Is 56:5; 63:12; אות ע׳ 55:13; גאון ע׳ 60:15; Jerus. to abide לע׳ Je 17:25 ψ 125:1, cf. Je 31:40; עד ע׳ ψ 48:9. g. of relations between God and his people, לע׳ 1 Ch 29:18 ψ 45:18; 85:6; 103:9; 145:21 Is 57:16 Je 3:5, 12 La 3:31 Jo 2:26, 27; עד (ה
ע׳ ψ 28:9 Mal 1:4. h.
of Messianic dynasty and king: (ל
ע׳ ψ 110:4; having divine throne 45:7;
name endures 72:17; established 89:38; God blesses him 45:3; of his reign, מעתה ועד ע׳ Is 9:6. i. =
indefinite, unending future: live לע׳ Gn 3:22 Jb 7:16; הנביאים הלע׳ יִחְיוּ Zc 1:5 the prophets, can they live
for ever? cf. חדל לע׳ ψ 49:9; c. neg. never Ezr 9:12 Pr 27:24. j. after death: שׁנת ע׳ Je 51:39, 57; בית ע׳ Ec 12:5; חַיֵּי ע׳ Dn 12:2; דראון ע׳ v 2; also v 3 Jon 2:7 Ec 2:16; 9:6. k. = age (duration) of the world: את העלם נתן בְּלִבָּם Ec 3:11 the age of the world he hath set, etc. (cf. especially NH; others i). 1. pl. intens.
everlastingness, eternity: תשׁועת עולמים Is 45:17; צדק עלמים Dn 9:24; צור עולמים Is 26:4 (RVm rock of ages); מלכוּת כל עלמים ψ 145:13; also 61:5; 77:8 1 K 8:13 = 2 Ch 6:2. m. special phr.: ם(ה
עולם (ו
עד (ה
עולם (מן
from
everlasting to everlasting, of י׳ ψ 90:2, חסד י׳ 103:17; benedictions 1 Ch 16:36 = ψ 106:48, Ne 9:5 1 Ch 29:10 ψ 41:14; the land given למן עולם ועד עולם Je 7:7; 25:5; מעתה ועד עולם from now and
for ever ψ 115:18; 121:8 (i.e. as long as one lives); of peoples hope in God 131:3; dynasty of David Is 9:6; of Gods acts, words, etc. Mi 4:7 Is 59:21 ψ 125:2, cf. 113:2;v. further i. עַד p. 723.
Brown, Francis ; Driver, Samuel Rolles ; Briggs, Charles Augustus: Enhanced Brown-Driver-Briggs Hebrew and English Lexicon. electronic ed. Oak Harbor, WA : Logos Research Systems, 2000, S. 761