Hello thanks for asking from HCM for your health related queries I can understand your problem. First of all I would like to tell you that even if he is 40 years old he can have good erection. His poor erection is not because of his age. At this age most of individuals have normal erections. One thing you should ask your husband that if he have spontaneous early morning erections while sleeping? If he is having erections of penis during sleep in early morning then we can practically rule out organic cause for his problem. Also get his Blood pressure and Blood sugar levels checked to rule our hypertension and diameter. Both are known to cause erectile dysfunction and should be ruled out. If every thing comes normal then you should consider consulting a psychiatrist along with your husband for your problem. Try to spend more and more time in foreplay and in exciting each other. More time during foreplay will result in hard erection. Discuss with him about his problem directly and try to find out the solution. Alleviate his anxiety and guilt of not having poor erection. Anxiety is also one of reasons of poor erection. These psychological methods will improve his erection. Medicines like Phosphodiestrase inhibitors as Sildenafil, Tadalafil etc are commonly used for erectile dysfunction. Both these drugs are usually given to patients for about half to one hour before intercourse and help to improve erection. Consult a psychiatrist for prescription of these drugs. Thanks, hope this helps you. Take care