Nope, You're good.
When we add the amendment and water to the Pro-Mix, there's a period of time when the soil chemistry isn't healthy for plants, so we make sure by waiting for a month for everything to stabilize. After that, all's good.
The only risk is letting the soil dry out, which is understandably hard on the soil life. So we try not to do that.
I don't pay much attention to how old my soil is, unless I've mixed in more amendment.
When we add the amendment and water to the Pro-Mix, there's a period of time when the soil chemistry isn't healthy for plants, so we make sure by waiting for a month for everything to stabilize. After that, all's good.
The only risk is letting the soil dry out, which is understandably hard on the soil life. So we try not to do that.
I don't pay much attention to how old my soil is, unless I've mixed in more amendment.