At this age, the old people actually don't have much material requirements. According to your description, to put it mildly, they meet less. Instead of asking what to send, it is better to spend more time with the old man and chat often to let him know that you young people are doing well.

If you can't visit the elderly often on weekdays, you might as well buy a radio or something, because the elderly are very lonely. QAQ at least listens to the radio, and the old people don't think about anything.

Finally ... it really doesn't matter what you buy = =

If you lose face in front of relatives empty-handed, milk, fruit and snacks that the elderly like are enough.