I know someone who was out for 20 years and then won a British Champs at 65
I'm going for the "preserve myself in ice for 30 years then come back when I'm the last man standing" option. But even then I'll get cuffed by someone's ashes.
It can take a long time to see the consultant, and then quite a while before anything gets done, even in normal times, but on the plus side the rehab might well be quicker than you think (though I don't recommend the Joan Benoit option of running and winning the US Olympic marathon trial on Day 17 after surgery...)
Thankfully my amibitions once returning to sport post-op would be somewhat less lofty and therefore more easily resisted ;-). Just finding a few controls without expiring will do me. I'm more focussed now on avoiding any pre-op belly ballooning!
Haven't you signed up for WMOC 2050? There's still hope...