How to communicate with the old people with outdated traditional ideas after 8090?

Yes, some people have a hard time changing their minds, especially the elderly. But you can't reason with them, even if they think your reason is correct, they won't listen to you for self-value protection. So don't worry, you should be subtle. Only time or events can show that our ideas and practices are correct, and slowly they will agree with your point of view and let practice tell them the truth. If you tell a short story or joke, but the meaning can express the information you can convey, this is the most direct and effective way. But things should be realistic and not too far away. But it's hard to do. Try slowly, as long as you have confidence, you will succeed.