Leader: Jihyo (1997/02/01)
Oldest: Nayeon (1995/09/22)

Leader: Exy (1995/11/06)
Oldest: SeolA (1994/12/24)

Leader: Seungyeon (1996/11/06)
Oldest: Seunghee (1995/10/10)

Leader: Heehyun (1995/06/16)
Oldest: Eunice (1991/09/02)

Leader: Jimin
Oldest: ChoA

*Note: It should be noted that after ChoA left, Jimin is now the oldest member and the leader. However, for the bulk of AOA's career, Jimin was not the oldest member.

Leader: Jinjin (1996/03/15)
Oldest: MJ (1994/03/05)

Leader: Bang Chan (1997/10/03)
Oldest: Woojin (1997/04/08)

Leader: Taeyong (1995/07/01)
Oldest: Taeil (1994/06/14)

Leader: Sungjin (1993/01/16)
Oldest: Jae (1992/09/15)

Leader: Jihun (1995/02/20)
Oldest: Youjin (1993/02/10)

Leader: Youngbin (1993/11/23)
Oldest: Inseong (1993/07/12)

Leader: Hui (1993/08/28)
Oldest: Jinho (1992/04/17)

Leader: B.I (1996/10/22)
Oldest: Jinhwan (1994/02/07)

Leader: Kang Seung Yoon (1994/01/21)
Oldest: Kim Jin Woo (1991/09/26)

Leader: JR (1995/06/08)
Oldest: Aron (1993/05/21)

Leader: JB (1994/01/06)
Oldest: Mark (1993/09/04)

Leader: Zico (1992/09/14)
Oldest: Taeil (1990/09/24)

Leader: RM (1994/09/12)
Oldest: Jin (1992/12/04)

Leader: Suho (1991/05/22)
Oldest: Xiumin (1990/03/26)

*Note: It should be noted that Suho was the oldest member in EXO-K, when EXO was still divided into EXO-K and EXO-M. However, Xiumin was the oldest member of EXO-M but not the leader of the unit.

Leader: G-Dragon (1988/08/18)
Oldest: T.O.P (1987/11/04)