I would tell them to invest in art. Art is a great investment because it can be used to decorate your home, and it increases in value over time. It's also a good way to make money for your retirement.
If you're thinking about investing in art as an investment, then I'd recommend buying pieces that are unique, but still affordable. You don't want something that's going to cost thousands of dollars, because then you're just putting money into someone else's pocket instead of your own.
I would also tell them that there are lots of ways they can use art as an investment—for example, they could buy a piece and keep it in storage until the price goes up so they can sell it at a profit later on down the line. And finally, I would encourage other readers by saying that investing in art is one of the most fun ways to spend money.