On the Sims 3, how do you stop certain Sims from aging or lengthen their life, but let others age normally?

I know about the aging on and off in the options menu, but I want to let certain Sims age naturally, and have others not age at all. On the Sims 2, you could purchase this drink in the lifetime rewards that would add a couple days onto your Sim's lifespan if they drank it. Is there anything like that on the Sims 3?On the Sims 3, how do you stop certain Sims from aging or lengthen their life, but let others age normally?
make ambrosia.

you need 10 skill in cooking, fishing, and gardening.

once you can grow life fruit and catch a deathfish and learn the recipe you can make it. reverses aging every time you eat it.On the Sims 3, how do you stop certain Sims from aging or lengthen their life, but let others age normally?
no there isnt anything like that on sims 3 right now. it may come with expansion packs though.

in your options menu, as you know, you can turn your sims lifespan to various settings. epic is the highest. you can also turn of aging.

if you keep story progression on, but turn aging off, you sim wont age but everyone around you will.

be careful though if you have other families in the town they will age.On the Sims 3, how do you stop certain Sims from aging or lengthen their life, but let others age normally?
If you can find life fruit %26amp; plant it you can reverse aging a day for every fruit eaten. No need to make weird recipes. Just eat the fruit on its own. I think I got mine doing an opportunity. :)