Do you have a hard erection? Is that the problem or do you not have an erection at all? Please elaborate.
What condition are you taking warfarin for?
Let me know.
Okay, then the warfarin is not the problem.
Having an erection at all rules out most of the organic conditions of Erectile dysfunction, but this seems to be due to either a lack of blood flow to the penis or due to nerve insensitivity. Both of these can be attributed to age.
However, before any conclusions are drawn, a thorough investigation needs to be done, examination, doppler ultrasound, MRI and nerve conduction studies.
There are medication to rectify the issue and if medical therapy is not acceptable then surgical insertion of penile implants can solve the issue. Your Urologist can help you with all this.
Let me know if you have further questions.
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Wish you good health.