I'd say older people might be more inclined to complain, mainly because they are generally less adaptable to change. They've lived longer, seen more, and often have a set way of how things should be. For example, our grandparents often grumble about new technology – it's not that they dislike it, but it's just so different from what they're used to. This resistance to change can sometimes come across as complaining.
我想说,老年人可能更容易抱怨,主要是因为他们通常不太适应改变。他们活得更久,见识更多,并且通常对事情应该如何发展有一套固定的方式。例如,我们的祖父母经常抱怨新技术——并不是他们不喜欢它,而是它与他们习惯的技术有很大不同。这种对变革的抵制有时会被视为抱怨。