I'll go out on a limb and say we both know that by 'dated' one doesn't just mean 'from a particular date in the past,' but 'hasn't aged well.'
But if more clarity is needed: I don't think that in twenty years this building will have aged well.
I think my concern is that the design on the balcony is too bold and unsubtle, and that's why in years' time it'll look dated. So it's not about materials per se, but about design for me. Compare the purple-ish glazing on I believe it's 1001 Bay. Does it look bad? No, not overly. But it does look dated, namely to the 80s. I think Five will be similar.I'll take the opposite view and argue that with its attractive and unique architectural features and high-quality materials, it will still be an interesting and attractive tower in 20 years' time. The towers that don't age well are those that are bland, cheaply finished or ugly from day one.