The transition is what is scary and complicated with post-growth and that is very much understandable… Because we can envision how it would look like, but for this, systemic change is needed, and we know how well changing everything at the same time is impossible and/or won’t go the way we envisioned it at first. And pensions are not working the same everywhere, so transitions wouldn’t be the same everywhere too.
Couple references though about transforming pension schemes and how a different monetary system would contribute to it too, hope it may help already! (Second one is a PhD dissertation, but the guy already published articles, at least the dissertation is open access!):