I was in my late 40's before I managed to negotiate permission to ride a century every month. I've kept that up for eight years or so, having missed only a few months along the way.

​​​My advice would be to try to negotiate (with your wife) permission in principle to ride a century-a-month now, and stick to that in principle even if you have to sacrifice a month here and there.

Once you have permission in principle, you still have to negotiate each century ride individually, and here you have to be willing to lose. You may get a little credit for that sacrifice, putting you in a stronger negotiating position for the next month.

I'd also present your wife with the calendar for the whole month well in advance, and let her identify the best weekend for your monthly century. If she's already given permission for a given date, it's easier to demonstrate that not riding your monthly century is a real sacrifice. A sacrifice you're willing to make, of course! But a sacrifice nonetheless.

Good luck!

By the way, we used to have a "century a month club" thread on this subforum, but I let it die when it became just me posting every month. Please start a new one! I'll join, I promise!

Either way, I don't see how this would affect your tour plan in the fall (but maybe I'm missing something).

One last point: there is a long distance riding subforum, and they have their own century-a-month thread there