The important difference is that society doesn't need pensioners to work (in fact, retiring to free up jobs for younger people is often considered desirable), so the main concern around UBI, which is that it discourages people from working, does not apply.
In fact, the AOW age has been increased from the age of 65 (eventually it will be increased to 67) to ensure the ratio of working population to retired workers is large enough to keep the system sustainable. Even covering just two extra years was considered too expensive. Obviously extending the system by another 47 years would be a huge challenge.
> which is that it discourages people from working
The OP mentioned nothing about that, do you mean "my main concern around UBI"?
FWIW I've never seen a UBI study that has actually found a statistically significant decrease in working among anyone but mothers with young children and kids in school. Granted there's no increase either as some UBI proponents have suggested. It seems to be pretty neutral.
In fact, the AOW age has been increased from the age of 65 (eventually it will be increased to 67) to ensure the ratio of working population to retired workers is large enough to keep the system sustainable. Even covering just two extra years was considered too expensive. Obviously extending the system by another 47 years would be a huge challenge.