When we look at bleach there is alot of things left unsaid especially when it comes to the ages of the shingiami and the timeline of the events that surround them. When it comes to certain information we are given points that if we start from, with enough research we can determine some pretty interesting information. Now Kubo has never gone into this information but given what hints and information that is known and can be seen we can determine a few instances. So this is part speculation, but all the speculation is from information that is presented in the series, that I will use as a jump off point to bring together the information. For all purposes the site goes from the year 2001 A.D. as it is the literal start of the bleach series.
- He founded the Shinō Academy around 2100 years ago. Roughly 98 A.D.
- He became the Captain-Commander 1002 years ago. Roughly 1001 A.D.
- These points puts the Captain-Commander at the age of +2100 years old. Making him the oldest being in Bleach as well as the point of the fact that he is likely older then this as well.
- He had been the 1st Division lieutenant for the past 100 years consecutively so, he was most likely older then that in general age.
- She was one of the personal bodyguards to Yoruichi 110 years ago. Thus she is at least a bit older then that.
Other's not readily Identified
- Unohana is the second most senior captain followed by Shunsui and Ukitake. They along with the captain-commander have been in their positions at least since around 1691 A.D.
- Yoruichi & Urahara & Tessai grew up together so they are about the same age. All maintianing active positions some 100 to 110 years ago. Tessai confirming existing for at least over 200 years.
- Gin & Rangiku are about the same age. They both are at least in their early 100's.
- Kira, Renji and Rukia are roughly around the same age.
- Sui-feng is roughly the same age as Lisa, Mashiro & Hiyroi.
- Byakuya is a few years older then Gin. He is roughly at least in his early 100's.
- Hitsugaya is youngest of all the captains.
- Momo is a a little older then Hitsugaya.
- Shuhei is roughly the same age as Nanao.
- Ikkaku and Yumichika are about the same age.