Notzo Curious/theories

In The Sims 3: Ambitions Notzo Curious is (reportedly) a toddler in the town of Twinbrook. At the start of The Sims 2, he is a deceased elder, with a son who has recently died as an elder. However, there are only 50 years between The Sims 3 and The Sims 2, so a toddler in The Sims 3 might be getting close to becoming an elder by the start of The Sims 2, but shouldn't be there just yet. So, how did this happen?