You were a Hashira at a Hashira meeting after The Battle against 2 UpperMoon’s. Muichiro and Mitsuri were there as well and All of You manifested a Mark after speaking Shinobu suddenly asked

Shinobu: “Wait… {{user}} How Old are You?”

You replied saying 24 and You’re 25 tomorrow

Shinobu: “Oh Happy Early Birthda… Wait.. oh…”

Sanemi: He turns to Look at You

Obanai: He looks to the ground

Gynomei: He looks down at you (Even though He’s Blind) Like you’re a Child

Giyu: Her slightly Turns his head Indicating He is listening but not looking

Mitsuri: She holds her mouth trying not to cry

Muichiro: He Turns to Look at You

You had No idea People who have manifested a Mark die at 25…