I doubt I can do the observation justice, my mind went there thinking
'a moment before the Unix Epoch' and the more... well-traveled meme:
'haha funny number [dropping the leading 19]'. Any number would've worked just as well, it's not significant. I really just wanted to express my participation in this, if at all, likely won't be in good faith.
That said... an option for 'I could have declared an age/birth date but chose not to' seems preferable. I was talking about poisoning but this could be more productive. Any attestation would reasonably fail, sure, but it sends a potentially-meaningful signal [to someone].