Member ages
JO1 Member Ages and Birthdays
JO1 member ages and birthdays ranked oldest to youngest, from Yonashiro Sho at age 30 to Mamehara Issei at age 24.
Average26.9years old
Oldest to youngest
| Rank | Member | Age | Birthday | Position |
|---|---|---|---|---|
| #1 | Yonashiro ShoMember | 30 | Oct 25, 1995 | Leader |
| #2 |  Kawashiri RenMember | 29 | Mar 2, 1997 | Performance Leader |
| #3 |  Shiroiwa RukiMember | 28 | Nov 19, 1997 | Vocalist and Rapper |
| #4 |  Kono JunkiMember | 28 | Jan 20, 1998 | Vocal Leader |
| #5 |  Sato KeigoMember | 27 | Jul 29, 1998 | Dancer and Vocalist |
| #6 |  Kawanishi TakumiMember | 27 | Jun 23, 1999 | Lead Vocalist, Lead Dancer, and Rapper |
| #7 |  Kimata SyoyaMember | 26 | Apr 5, 2000 | Rapper, Sub-Vocalist, and Dancer |
| #8 |  Ohira ShoseiMember | 26 | Apr 13, 2000 | Lead Dancer, Vocalist, and Rapper |
| #9 |  Kinjo SukaiMember | 26 | May 6, 2000 | Vocalist and sometimes a Rapper |
| #10 |  Tsurubo ShionMember | 25 | Dec 11, 2000 | Main Rapper |
| #11 | Mamehara IsseiMember | 24 | May 20, 2002 | Center |