Is it possible to have different age plants in a rDWC system?

[JHAW]

TL;DR: I want to have multiple plants but in different developmental stages in my rDWC, is this possible with them needing different ppm's?

So they would all be in veg for instance. But I was planning on having the ages staggered by about 2 weeks each. So one would be 2 weeks, 4 weeks, 6 weeks, and 8 weeks. At that point, I'd then take the 8 week one and put it into flower, then add a new clone that was ready to replace it.
The same would go for my flower room, 4 plants roughly about 2 weeks apart (assuming same finish time Ect).

This will be my first non soil grow, and I'm reading about ppm's and the like. But I can't specifically find anywhere saying this is a bad idea.
The problem I see coming up would be that a plant that is 2 weeks old needs lower ppm's than a 2 month old plant. Same type of problem with the ones in flower too, different stages of development.
So is there a safe ppm number that would be good for my veg rDWC and my flower rDWC?

Thanks.

[LOC NAR on probation]

You can do it in veg and run your ppm's on the low side.

BUT not in flower and all on the same recirculating system. How would you flush at the end ? We run our Ph at 5.8 early in flower and then hold it low at 5.2 towards the end for dif nute uptake. And dif additives later in flower. If you run sea of green you need to break up each stage in flower to it's own system. We did learn the hard way it makes for problems.