My mom will be 90 in two weeks and we are having a party.
but, as someone who is up there --- here is what i would love from my kids - Put up a new vertical blind to replace the one from when you visited and your dog chewed a hole in it.
Paint my bathroom(you could redecorate too, I won't mind), clean my gutters, help us move heavy stuff, get your stuff out of my house and into your own so i have room for my stuff. I don't need anything, but I sure can't do a lot of heavy lifting or climbing anymore.
Also I enjoyed some meals that my son sent when i had surgery, they were from DineWise.