Powering up Brew Potion

[FreeTheSlaves]

I am going to ramp up the power of Brew Potion by adding 'elixirs of youth' and 'potions of longevity'. I reject the notion of CWI being the prerequisite for balance reasons within our campaign.

This will be particularly desirable for the shorter lived, non-spell casting characters because our campaign will span a generation (aproximately 25 years).

I know that they existed in previous editions but has anyone got 3.5 versions of them (and prices)?

Thanks. FTS.