What on earth makes you think they will need taking care of when they turn 50?
I think you need to understand that 50 isn’t that old and the vast majority of those age 50+ are quite vibrate and very capable. People begin new careers, climb mountains. go parasailing, you name it and they can do it. Raising a second family, exploring the world. My goodness, once the children have grown and can be on their own these parents begin a new life. Not a better one, just new and different. My husband and I married at the age of 50 and it has been wonderful!
I think what you might want to concern yourself with is … how will I take care of myself when my parents turn 50.
Best wishes 🙂