Since they have four sections that the traits are organized into, why not just make it so you can have one trait from each section?
An even better (but slightly harder) idea is to make new sections. You would choose one trait from each section for each life stage. My ideas for each life stage:
- Toddlers: One emotional trait, one behavioral trait
- Child: One hobby, one personality trait, one lifestyle trait
- Teen: One hobby, one personality trait, one mental trait, one bad trait
- Adult: One hobby, one personality trait, one lifestyle trait, one bad trait, one mental trait
