I don't think I have anything older than (unopened) 2018 at this point, and right now, I'm mostly working on getting through the stuff I bought then. Like lapushka, I try to somewhat organise them by date or an equivalent logic, but I have a tendency to buy a lot of product x around the same time, so I remember the timings of the purchases quite well without sorting them out.
Right now, my primary use-it-up projects are some commercial but "natural" masks from O'Herbal and a 5-litre (!!) jug (it's like a gasoline canister, haha) of organic conditioner from Mother Nature's Goodies. Giving the latter product a good shake was a proper workout. This is its final shelf life year, so it was time to start on it, and it'll probably take me most of the year to get through it. Both things were purchased in 2018 and are subpar for my hair.
Yes, even my open and not-yet-expired Shea Moisture and similar products develop a weird, hardened, yellow-ish layer on top if I go a while without scooping product.
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