In some ways I'm fearful of the future because I'm alive now. Not in the past, but now. Nowadays there are more human beings than there have ever been in all of history, over 7 billion... So it's statistically more likely I would exist now, rather than in the past. That's fine.

But why was I not born later in the future? Since the world population seems to be ever increasing, wouldn't being born in the future be even more likely still? Maybe, the world population does not grow, and the trend stops. Maybe, something catastrophic happens.If something catastrophic happens, then if any human being were to be alive, it'd be very likely to be now, but very unlikely thereafter.

The problem feels reconciled if I remember how unlikely things can happen. If you pick a random human in all of history, you'd be much more likely to pick a random person from modern times than a person from the Middle Ages. But humans existed in the Middle Ages.

So if I'm to be a random person from the history of human civilization, it might be an unlikely choice for me to be alive now (rather than at a later date, when were are more populous) but that's still an entirely possible, valid outcome. I just don't want to know what the actual likelihoods are.