Prodigal

Humanity can be prodigal with time, squandering precious years before realizing it is the one resource that cannot be regained.

Prodigal: spending money or resources freely and recklessly; wastefully extravagant.

Synonyms: Wasteful, extravagant, profligate, spendthrift.

Antonyms: Frugal, thrifty, economical, parsimonious.