What Vitamins and/or supplements for hair when getting older?

I'm not trying to offend anyone or disrepsect my mil. But the other day i was really freaked and grossed out when dying my mil's hair. Her hair is very very very thin and just falling out all over the place. It seemed so fragile that I was trying to be careful to not pull anything out. I could see her scalp clear as day and her hair is just everywhere in this house. She's under the age of 60 and does nothing but sits around all day and watch youtube. She does not take care of yourself.

It made me go into my pantry and take biotin vitamin as soon as I was done. i get that thin hair comes with old age but the way her hair was really freaked me out. What are some good vitamins and/or supplements i can take when i start getting older for my hair so that it doesnt become like hers? Im sorry, i know it seems mean but im really trying not to be.