Not everyone is in the fortunate position of no longer having to need to work

To be honest, we don't know how may such people there will be. In normal circumstances stopping the 'triple-lock' on pensions is such a vote loser no one considers it seriously, but something like the effects of this virus could get both sides of the house to agree it is should go. Then many pension funds are based on the stock market, so the value of pensions involved could drop significantly. If there is a forced devaluation it could eat up savings...

There may be quite a few pensioners forced back to work. We can't be sure.