Age Limit for Sculptra?

Yes, Sculptra can still be used.  I would encourage you to see a board certified plastic surgeon for an evaluation to see how much Sculptra would be needed. 

While there is no true age limits for Sculptra, from my professional experience, I have found that younger the patient going through Sculptra injection, less vials, and less treatment injections may be needed vs. someone who is much more mature with more significantly deflated complexion where much greater volume replenishment and additional injection treatment sessions may be required. This has to do with the fact that there has to be a relatively healthy mechanism of collagen production for Sculptra PLLA to work effectively. I have found for patients in their 70's and older, Radiesse may be more appropriate and gratifying for cheek augmentation and volume replenishment as there will be less dependence of the innate collagen production capacity.

Whether or not Sculptra should be used is more related to the aging changes present than the chronological age of the patient.  Sculptra can produce very nice results in a 68 year old patient in situations of facial volume loss and realistic expectations.

Sculptra works very well in many patients who are 70+. The overall medical condition of the patient is more important than the age when considering Sculptra for facial augmentation.

I am happy to tell you that I do not consider 68 to be too old for Sculptra Injections!  Sculptra is indicated for increasing volume and to correct skin depressions, such as in skin creases, wrinkles, folds and also for skin ageing.  It is therefore an ideal option for the mature patient provided they are otherwise a suitable candidate for the treatment.  It may be that as an older patient you will require a longer treatment plan than a younger patient, but this can be discussed with your doctor prior to treatment.  If you decide to go ahead Sculptra treatment, then I wish you the best of luck with your results.