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For local skin application, there should be no harm. However, please consult a doctor before starting any medication. If you are a female and want to use it for vaginal infection, then yes, due to low estrogen, vaginal dryness at your age, the vaginal tablets and creams can cause harm. Take care!
Caneston is an anti-fungal agent that has been around for over 35 years, available in topical and internal versions. It is somewhat toxic.
When purchasing medications, to answer questions go to the PDR (physician's desk reference), which is generally available in most pharmacies. There is one for prescription and one for non-prescription drugs. When you purchase medications always ask for the manufacturers hand-out and not the condensed version often provided by the individual drug stores.
There are risks and benefits associated with all medications, and anti-fungal medications in particuliar are essentially poisons. There is no specific prohibition on using this medication over the age of sixty, except they have apparently not conducted tests on the elderly.
If you are taking the capsule, there may be a problem if you have degraded liver function. The answer is to consult your primary care physician for advice.