Pieris looking sad

Hi forum members, I have two Pieris Forest Flame that have thrived happily in a semi shaded garden border for around twenty five years. However, over the last two years they have started to look sick and distressed. They are not growing any new shoots and the leaves are small and pale. I have tried iron tonic, ericaceous fertiliser, and a mulch of home made compost but they have not improved their condition.
Does anyone know if they are reaching the end of their lifespan or is there still hope?
Does anyone know if they are reaching the end of their lifespan or is there still hope?
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