Well, when both of those ladies are 80 and gravity has done its work on them the one with the implants will still have a fine, out-standing chest. Hmmm, maybe that's not so good. (Thanks for the visual, right? I think we need a 'barf' gremlin right about here.)
How does the lady with the implants feel? Well let me feel her and I'll tell ya. BADUMP-BUMP!
But seriously folks. One thing to ponder is what will archeologists think in a thousand years when they open an old coffin and find two blobs of clear gel on top of old bones.