have been ageing
-he estado envejeciendo
Present perfect progressiveconjugation ofage.There are other translations for this conjugation.

age

The rich industrialized countries have been ageing whereas the developing countries are experiencing rapid increases in the relative number of children and youths.
La población de los países industrializados ricos ha ido envejeciendo, mientras que los países en desarrollo están experimentando rápidos aumentos del número relativo de niños y jóvenes.
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