If nothing changes, this site will probably last until 2030 or so. The youngest Baby Boomer will turn 66 by then. The site will still take in donations but by then, will it be worth the time and effort to run the site? Maybe not. If that's the case, it's been a heck of a run, that's for sure.
Also for your consideration is that a lot of the current donations are not just boomers, but the older high end of life boomers, not insignificantly the Qanon supporters who give in large amount to maintain access to the site while other sites ban them. Those folks are the oldest of the old and no one should count on their support indefinitely and unfortunately many have passed on in The last four or five years. Others have just disappeared, perhaps to bad health or death.