Panatomic-X (exp 03/1986) still has full speed and low fog.
But latent image does degrade over time.
I developed a couple rolls and a fresh sensitometry exposure.
10 minutes in D-76 1:1 usually gives me .62 CI, so I thought I would develop a little less to achieve a more normal contrast.
I was disappointed the negatives look a little thin and flat. But I was pleased to see that I had pre-exposed a sensitometry strip on one of the rolls, taken last year.
Conclusion: I will resist the urge to give it less than 10 minutes in the future. And the latent image will degrade over time so process promptly or give more exposure and development if you think it may be a year before you develop it.