Because their website is still stuck in the stone age, all I've got to go on at the moment is a screenshot of the front page of their print edition, which seems to imply that these numbers represent some kind of swing to No since a previous comparable poll. The last pensioners' poll I can recall was last Easter, but I'm not sure whether it asked a question about independence, and unfortunately the datasets are missing from the Survation website (or the link isn't where it should be, at the very least). There was also a pensioners' poll about a month prior to the first indyref which put Yes on 37% and No on 63%, so perhaps that's the swing being referred to. But these are online polls we're talking about, which are conducted among volunteer panels. Over-60s resident in Scotland must make up a very small percentage of Survation's volunteer panel, so it's at least open to question whether a sample of 1000 people is going to be properly representative of the target population. As with all of Survation's polls, it also has to be borne in mind that post-indyref polling is not directly comparable with pre-indyref polling, because weighting by recalled referendum vote has been introduced to tackle a previous inbuilt skew towards Yes. It's conceivable that may have had a particularly exaggerated effect upon this particular segment of the Survation panel (if so, we should see signs of extreme weighting when the datasets appear).
Certainly if there had been a genuine swing to No among pensioners, you'd expect to see some evidence of it in the age-based subsamples of other independence polls. And yet the Ipsos-Mori poll a couple of days ago put support for Yes among over-55s at 40% - that's 7% higher than in the same firm's final poll of the 2014 campaign, suggesting if anything that the pro-Yes swing may be strongest among older people. Survation's own final telephone poll of the 2014 campaign reported a Yes vote of 29% among over-65s. Even allowing for the somewhat more pro-Yes tendencies among the 60-64 age group, that implies the Yes vote among over-60s in general was no higher than the low 30s - ie. the difference from today's poll is not significant. And the final Panelbase poll of the 2014 campaign put Yes support among over-55s at 38% - not meaningfully higher than the 35% recorded in the most recent Panelbase poll for Wings.
To be fair, it's perfectly true that any swing to No among pensioners would be a cause for some concern, even if it has been offset (or more than offset) by movement to Yes among younger people. The reason is that pensioners are more likely to physically turn out to vote. But I'm struggling to see any compelling evidence that such a swing has actually occurred.
* * *
If you've enjoyed my writing in recent months and feel a strange inexplicable urge to 'buy me a hot chocolate', bear in mind that my fundraiser from two years ago is still open for additional donations - it can be found HERE.