Had the idea to post this since I worked out each of the boys ages. This timeline is the original thought of their backstorys (minus Vito who will follow the Male Pregnancy AU as to fit in with the profiles created.)
Brothers Of The Galaxy Timeline
>1980-Peter Quill is born.
>1983-Matais Phenix is born, Peter Quill is 3.
>1988-Peter Quill is taken aboard Yondu's ship at age 8, Meredith Quill dies, Matais Phenix is 5.
>1991-Matais Phenix is taken aboard Yondu's ship at age 8, Tallula Phenix as well as all her children (minus Matais and two boys younger than him) as well as her current husband dies, Peter Quill is 11.
>1995-Riddick Rygel-Obfonteri is born, Peter Quill is 15, Matais Phenix is 12.
>2001-Vito Udonta is born, Peter Quill is 21, Matais Phenix is 18, Riddick Rygel-Obfonteri is 6.
>2004-Riddick Rygel-Obfonteri is made an official member of the Archs symbolized by hus branding at age 9, Peter Quill is 24, Matais Phenix is 21, Vito Udonta is 3.
>2006-Riddick Rygel-Obfonteri sneaks aboard Yondu's ship to attack them ends up getting saved by Kraglin at age 11, Peter Quill is 26, Matais Phenix is 23, Vito Udonta is 5.
>2014-Guardians of the Galaxy Vol. 1 & 2 (two months apart), The Guardians of the Galaxy are formed, Peter Quill is 34, Matais Phenix is 31, Riddick Rygel-Obfonteri is 19, Vito Udonta is 13.
>2018-Infinity War, Peter Quill is dusted at age 38, Matais Phenix is dusted at age 35, Riddick Rygel-Obfonteri is not dusted but stationed at an unknown location at age 23, Vito Udonta is not dusted and stationed on Earth at age 17.
>2023-Endgame, Peter Quill is returned at age 38, Matais Phenix is returned at age 35, Riddick Rygel-Obfonteri is 28, Vito Udonta is 22.
>2025/2026[currently unclear but is somewhere between the two years]- Thor: Love and Thunder, Peter Quill is 40, Matais Phenix is 37, Riddick Rygel-Obfonteri is 30, Vito Udonta is 24.