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This. But that's usually for people who are constantly compressing and decompressing it i.e. backpackers. For the average person who is just using it casually, it should be okay. But yes, quality down will loft for decades to come and its loft can easily be restored. There are people rocking Western Mountaineering sleeping bags from the 70s, and supposedly Yvon Chouinard still uses a mummy bag he made in the 1972 as his primary sleeping bag:
JB
It may have changed in the last few years, but I’ve always been told that synthetic insulation will eventually (sometimes quickly) lose its loft while down can be reinvigorated.