about saiyans

in the au Saiyan are more powerful and frieza destroyed planet vegeta same year but a lot more saiyans get to escape form the planet's destruction . it will not affect the story it just provide me with all variable i need of a at least note-able backstory. as I what our character will be close to Goku's age as in dbz Broly was born on same day as Goku and in dbs. Broly was same age as vegeta so in my story i am going to make broly and our main char (broly's twin brother) with few other oc character and few other villains will be fun