One can expect that with age, some changes in sexual function may occur including decreased libido and the difficulty obtaining erections. For such issues, a referral to the urologist or sexual medicine specialist is suggested. They can evaluate for root causes such as hormonal imbalances or other health concerns, and create tailored treatment plans accordingly. It is advisable to approach such issues with a professional who can provide targeted advice and support.

At your age of 56yrs, there is depletion in testosterone levels and even there can be other factors which can be involved.... Detailed discussion of the problem is needed.. your problem of erectile dysfunction and pre-mature ejaculation are most commonly occurring in all ages of men, fortunately these both have high recovery rates through ayurvedic medications. 

I am explaining briefly about erectile dysfunction and pre-mature ejaculation so that it takes fear out of you. 

In erectile dysfunction, men are not able to get or keep an erection that is sufficient to have penetrative sex. In premature ejaculation men come out Very fast, men gets discharged either before penetration or immediately after penetration, they hardly get some strokes, so the female partner remains unsatisfied. 

This may be due to so many factors like High cholesterol, High blood pressure, 
Diabetes, excessive masturbation, excessive porn watching, nerves weakness, 
Obesity, thyroid, heart problem, alcohol, Tobacco use, Sleep disorders, Low testosterone, tension, stress etc. 

These problems of erectile dysfunction and pre-mature ejaculation are very much treatable. 
I am suggesting you some ayurvedic medicines. 

Take Aswagandhadi churan half teaspoon in the morning & in the night. 

Take Capsule SHILAJIT one in the morning and one in the night, 

Take tablet manmath Ras one in the morning and one in the night. 

Take tablet Pushp dhanva Ras one in the morning and one in the night. And take tablet Sidh makardhwaj Vati with gold, one in the morning and one in the night after food. 

All the above preferably with hot milk or with water 

Also apply and message Shri Gopal tail on your penis three times a week for 2 to 4 minutes. 

Avoid junk food, oily and spicier food, alcohol, tobacco, tension and anxiety. 

Start doing brisk walk or running or cardio exercises for at least 30 min a day. Start doing yoga, pranayama, meditation, Vajroli mudra. Ashwini mudra, kegel exercise for at least 30 min a day. 

Start taking hot milk twice a day. 

2-3 dates in the morning and in the night with milk. 

Do all the above suggested treatment for 3 months and see the results. 

If you don't get satisfactory results then please go to your family doctor or a good sexologist.