Life was created only once, by accident. It’s just perpetuating ever since. That’s why science has such a hard time recreating it. Two RNA molecules got accidentally matched, which created self-replicating DNA. That’s how life started.
At some point in life, when thinking of an engagement, of things that you liked before, you just cannot summon the energy to do it, you just don’t care anymore. That’s the point when life passes you by.