How to make parents feel loved?

I have this genuine question, how do you actually make parents feel loved, happy. I am so grateful for my parents, I am truly blessed to have them. I know that their time is ticking and I really want them to make beautiful loving memories, make them happy. I know succeeding in life is one thing, but I don't want their entire happiness to be based on kids, I want to make it worth while, I really love them. so anything that makes them feel loved? parents please feel free to comment