Does anyone know how old are the characters?

Banyi(MC) is mid to late 20’s considering he is a doctor,
Lin Li (ML) is a year to 3 years older than him
Lin Yi is probably 19ish last year(s) of highschool but shes behind bc of trauma (prob)
Big Bro Lin is like 33ish
Actor brothers are like 28 and 25 ish