One thing you're likely to discover is that, once thawed, older film goes bad faster than fresh film, even if it initially seems fine. In other words,
shoot it reasonably soon. In the case of Astia, when it does start going bad you might see some highlight crossover and a slight overall decrease in saturation. I wonder about my own stockpile of outdated 8x10 Astia. But I bought it for next to nothing, so whatever ... The 100F
is my more serious concern, but it's obviously not as old.