Children should really prepare well for their parents' wedding anniversary. Although they still like to reminisce by themselves, you have grown up after all. You should participate and create a family atmosphere.
And it is recommended to send gifts together, not individually, which seems disunited. It is recommended to give parents some expensive gifts. At their age, they are reluctant to spend money on themselves. Children should think about it. Send a couple necklace or ring, or watch. Don't be too ostentatious. For parents of the same generation, it is better to be more stable. Choose carefully.
Of course, memories are the most important thing for anniversaries. You can find their previous photos and make a digital oil painting, or directly make them into crystal and make a special shape. Haha, put them at home, it will be a good decoration. I hope it helps. I wish you all the best.