Sexual interaction is a normal human instinct and has no outer age limit. Maintain sexual vigor as you feel is right for you. Finally, if you find that you are staying by yourself and losing interest in relationships and things you previously enjoyed, you may have depression. Discuss this openly with your physician. There is a great deal that can be done about depression at any age.
Life has many frustrations and it is normal to become angry once in awhile.
However, some people remain angry often. This is not normal. Constant anger causes chemical changes in the body such as increased adrenaline levels. Increased chance of heart attacks and strokes have now been demonstrated in the medical literature in these people. Everyone has some stress, some time.