Why is my hair dry?

Could be a number of things. Here are things to do that would help or that you may be lacking:

Don’t wash your hair every single day

Use lots of conditioner

Rinse with cold water

Reduce heat use on hair

You can do hair treatments, by using either mayonnaise, eggs, or oils

Your diet can sometimes impact your hairs health 

The scissors might not have been sharp enough or the right kind. I used to cut my own hair with regular scissors, which would cause split ends making it feel dry 

Your advanced age may have something to do with it. Try using a conditioner. And don't wash your hair as often, and stop using products that may damage your hair, and lay off the hot irons.