Adult sims die leave toddler behind

Love this game but the sims are now aging. I had two married adult sims have two babies. The adult sims became seniors then passed on while one child was only a preteen and the other was still just a toddler. Now the toddler is at home with no parents because theyre dead. Shouldnt the adult and senior sims age slower than infants, toddlers, preteens and teens??

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