Agreed completely.
Without death, I could enjoy sitting all day staring at the stars, or even at air.
Now it feels like the clock is running.
Wow. Powerful stuff.
Aging is...time's winged chariot hurrying near. (Marvell)
Aging is...deserts of vast eternity. (Marvell)
Aging is...having lost but once your prime, ye may forever tarry (Herrick)
My own feeble take:
Aging is...attempts to cast in verse and stone that which lasts forever, in vain efforts to contrast with that which passes so quickly
Aging is...assuredness of monuments and not endless void.
Aging is...the eventual replacement of the universe with consciousness
Aging is...diving into the eternities between 2 seconds or 2 microns, knowing that eternity can be found there, if not in the foreboding arrow of time.
Aging is...not being able to share eternity with time.
Aging is...a counterintuitive opposition to the timeless, still and eternal nature of consciousness.
Aging is...not having me as its mistress.
Aging is...losing now. Yes, losing the struggle! It is already defeated. We may take several generations to sort it out and may only recover those who wish to return from information fields surrounding and ringing our earth, but most whose consciousnesses have fled from time and matter will not likely return, lest they left true love (familial and romantic) and are having difficulty in the hereafter and cannot well commune with their earthbound lovers and do not wish to move on. They will reassemble for us.
Carpe diem poems clearly indicate that the cavaliers were obsessed with this matter, and they were not always into getting women in the sack. There would be more time for everything: from love to appreciation of beauty, and to, as you eloquently express and I clumsily try to paraphrase: to indescribable immersion and abandonment to nothingness, negative states and endless seas of star, cloud, ocean, sand and time.
Sorry. Just went off here!