| Cover | Mar. 29, 2022 |
| Cover [Abstract] | |
| Document Type | 8-K |
| Amendment Flag | false |
| Document Period End Date | Mar. 29, 2022 |
| Entity File Number | 1-38519 |
| Entity Registrant Name | AgeX Therapeutics, Inc. |
| Entity Central Index Key | 0001708599 |
| Entity Tax Identification Number | 82-1436829 |
| Entity Incorporation, State or Country Code | DE |
| Entity Address, Address Line One | 1101 Marina Village Parkway |
| Entity Address, Address Line Two | Suite 201 |
| Entity Address, City or Town | Alameda |
| Entity Address, State or Province | CA |
| Entity Address, Postal Zip Code | 94501 |
| City Area Code | (510) |
| Local Phone Number | 671-8370 |
| Written Communications | false |
| Soliciting Material | false |
| Pre-commencement Tender Offer | false |
| Pre-commencement Issuer Tender Offer | false |
| Title of 12(b) Security | Common Stock, par value $0.0001 per share |
| Trading Symbol | AGE |
| Security Exchange Name | NYSEAMER |
| Entity Emerging Growth Company | true |
| Elected Not To Use the Extended Transition Period | true |
