Yes. I can't think of a better use for them than saving a life (or hopefully lives) at the time when not only they're not going to be useful to me, but there will actually be no me to even be able to make use of them.
And I live a healthy life, so hopefully some of them might be useful whether I die of old age or any other cause (except falling into a meat grinder of course, then all this gym going and veg eating will be in vein).
Also, fingers crossed they'll find a dope body who's my HLA match and will need a brain transplant 🤞