SCHEDULE 13G/A 0001104659-24-116796 0002032751 XXXXXXXX LIVE 1 Common Stock, par value $0.00001 per share 12/31/2025 0001709941 BIOAGE LABS, INC. 09077V100 5885 Hollis Street, Suite 370 Emeryville CA 94608 Rule 13d-1(d) Kristen Fortney X1 2669243.00 0.00 2669243.00 35493.00 2704736.00 7.2 IN The amount reported in rows 5 and 7 includes: (i) 1,210,056 shares of the Common Stock of BioAge Labs, Inc. (the "Issuer") directly beneficially owned by Kristen Fortney ("Dr. Fortney") and (ii) employee stock options to purchase up to 1,459,187 additional shares of Common Stock of the Issuer, which are directly beneficially owned by Dr. Fortney. The amount reported in row 8 represents employee stock options to purchase up to 35,493 shares of the Issuer's Common Stock which are directly beneficially owned by Dr. Fortney's spouse, Justin Rebo, who has voting rights over such securities. The percentage set forth in row 11 was calculated in accordance with Rule 13(d)-3(d)(1)(i) promulgated under the Securities Exchange Act of 1934, as amended, and based on an aggregate total of 35,855,037 shares of the Issuer's Common Stock outstanding as of October 31, 2025 as reported by the Issuer in its Quarterly Report on Form 10-Q for the period ended September 30, 2025, filed with the Securities and Exchange Commission on November 6, 2025. BIOAGE LABS, INC. 5885 Hollis Street, Suite 370, Emeryville, CA, 94608. Kristen Fortney ("Dr. Fortney" or the "Reporting Person") The address of the principal business office of the Reporting Person is: 5885 Hollis Street, Suite 370 Emeryville, CA 94608 The Reporting Person is a citizen of the United States of America. Y Reference to "beneficial ownership" of securities for purposes of this statement shall be understood to refer to beneficial ownership as that term is defined in Rule 13d-3 of the Securities Exchange Act of 1934, as amended (the "Exchange Act"). As of December 31, 2025, Dr. Fortney may be deemed to beneficially own an aggregate total of 2,704,736 shares of the capital stock of BioAge Labs, Inc. (the "Issuer"), which consist of: (i) 1,210,056 shares of the Common Stock of the Issuer directly beneficially owned by Dr. Fortney; (ii) employee stock options to purchase up to 1,459,187 additional shares of Common Stock of the Issuer directly beneficially owned by Dr. Fortney, which were either vested as of, or capable of vesting within 60 days following, December 31, 2025, or are otherwise capable of being exercised for shares pursuant to an early exercise provision of the relevant stock option award agreement by and between Dr. Fortney and the Issuer; and (iii) 35,493 shares of the Common Stock of the Issuer underlying employee stock options which were either vested as of, or capable of vesting within 60 days following, December 31, 2025, and which are directly beneficially owned by Dr. Fortney's spouse, Justin Rebo, who has voting rights over such securities. As of December 31, 2025, the Reporting Person may be deemed to beneficially own an aggregate total of 7.2% of the Issuer's outstanding Common Stock. The aforementioned percentage was calculated in accordance with Rule 13(d)-3(d)(1)(i) promulgated under the Exchange Act and based on an aggregate total of 35,855,037 shares of the Issuer's Common Stock outstanding as of October 31, 2025 as reported by the Issuer in its Quarterly Report on Form 10-Q for the period ended September 30, 2025, filed with the Securities and Exchange Commission on November 6, 2025. 2,669,243 0 2,669,243 35,493 Y Y Y Y Y Y Kristen Fortney /s/ Kristen Fortney 02/13/2026