Problem of the age of the sims in Sims 3

The Sims 3 no doubt is an very good game. But the age problem is very huge. After the character i play become an old man, the time for him and she to die is about 73 days! Yet the time for both of them to become and old man from adult is onle about 25DAYS!

Besides, after i count the total age of the Sims, their life can last for about 120 days. If their life is calculate as 1 day to 1 year, the life time sure is very long.

Anyway, luckly the sims still can go to work although their wish is go to retire =.=