This is the 5015th most frequent Spanish word.
envejecimiento
The process of aging.
In this sentence, 'envejecimiento' is used as a noun to describe the process of becoming older, specifically referring to the demographic aging in a population.
El envejecimiento de la población presenta desafíos para la economía.
The aging of the population poses challenges for the economy.
Here, 'envejecimiento' functions as a noun to indicate the general process of becoming older.
El proceso de envejecimiento se ha acelerado en décadas recientes.
The aging process has accelerated in recent decades.
In this usage, 'envejecimiento' refers to the aging process as it applies to wine maturing and developing quality over time.