It’s about to be Spring where I am, but will be another six weeks before I can dependably ride outdoors. As usual, I’m about to start using that six weeks to get ready, probably using one of your Build Your FTP plans.
The catch is I’m 68. I can’t do four or five workouts a week any more. Yes, I know I can skip workouts, or say I’ve done them, and I know I could build my own customized workouts, but one thing we know for sure is that every year, each of your users gets one year older. It would be good to see either some age adjusted plans or the ability to customize the training plans.
Just do a six week plan over nine or so weeks. Or, instead of a “week” being 7 days, make it 10 days.
Sorted.
It doesnt work that way. The plans move on on a schedule. If you don’t complete a workout in the alloted week it becomes unavailable. They are also not available in advance. And if you skip a workout, or workouts, ultinately you dont get credit for completion.
Are you sure about that? Last time I looked they were completely flexible. 
I think now you have two weeks of grace period in the plans (based on what someone else posted a few weeks back - so would be good for someone to confirm), so it’s much more flexible than it originally was but I think you still need to complete the plan within 2 weeks of the end date.
There is limited flexibility, which is my point. I’m looking for the limits to be removed, and allow us the flexibility to customize plans the way we can with individual workouts.
And even that ignores the other part of my request. As I said, I’m 68. I am not unfit. I ride regularly, and used to run a lot, up to and including half marathons, but I can’t train the way I used to. I found long ago that I actually got faster when I cut training back from 5 days a week to 4, and then 3. I dont see any training plans built around someone like me, and I would wager that I am far from being unique amonger Zwift users.
I’m 56. I hear you. 
I just create my own training plans. It’s not hard.
I think a bigger issue is in general the training plans aren’t that great to start with. Many provide 4 or 5 high intensity days a week which you don’t need to be 68yo to require less intensity etc.
Personally I’ve moved to picking a few workouts I like and building my own for ones I can’t easily find on the platform, but I know that’s more of a pain and it would be better for them to revamp their plans and add a few new ones that let people have 2 or 3 intensity days per week with enough time to recover for the next key session, progressive loading over the plan, maybe even a longer periodized plan as well etc.