It's even better to lie once in a while. Bonus: lie about the same thing multiple times with conflicting details. My online presence in other spaces mention both a wife and boyfriend back-to-back lol
But as an account ages, you might leak more and more info about yourself, (e.g. IP addresses, interests based on what you post about, etc). If you then add on a personal detail like age, someone with bad intentions might be able to narrow down who you might be.
From the dawn of time we came; moving silently down through the centuries, living many secret lives, struggling to reach the time of the Gathering; when the few who remain will battle to the last. No one has ever known we were among you... until now.