If your founders have so little respect for each other that they can't acknowledge and gracefully accept the varying circumstances of their peers then the business is likely screwed anyway. If founders are that tightly wound, with respect to each other, then that's a recipe for turmoil ending in disaster.
The problem is that such things tend to go underground and they can pop out years later, for instance when you're raising your series 'A' or during an exit. And if and when that happens - besides it being unfair in the intermediate time - it can cause real problems.
This is one of my main reasons for advising against founders that are in very different phases of their lives, there is an element in there that you can not easily get rid of that might cause issues in the longer term.
