Here are some points I want to lay down first:
As we all know, Clone Force 99, also known as The Bad Batch, is inspired by the defective clone unit, 99, who was shunned away for his rapid aging from an experiment the Kaminoans were trying to do.
Secondly, we know that Omega is either 6 or 7 years old by the time of the Bad Batch Series, which takes place in 19-BBY, and it was mentioned by Tech that she is older than the squad.
Lastly, we know that Clones age twice as fast as humans, which means that in ten years, regular Clones would be in their 20's.
Now, what is my theory about? Well, I've been thinking about how quickly the Bad Batch age. Considering that they're an inspiration of 99, a Clone who aged very fast, and died at 21-BBY, and that Omega watched them progress in their tubes while she was still very much in her youth could mean that maybe, just maybe—Clone Force 99's aging is accelerated to the same amount to that of 99's. Especially since we see the Bad Batch debut in 19-BBY, and since they're inspired by 99, does that mean they were created and developed within those 2-3 years? And if they were created in 2-3 years, does that mean that in every 2-3 years, they grow ten times faster than humans? Just like 99. Only this time, their ages are managed properly so that they wouldn't grow unstably old immediately like what happened to dear 99.
I've been thinking about this lately, and if this is indeed true, then I'm somewhat saddened by the thought, due to how they will pass on right away. And so, if this theory is acknowledged and actually taken into account for a Bad Batch episode where they realize their extreme aging, I hope they'll find a cure for this, just like what was explored in the comics where Skirata forced Ko Sai to stop the accelerated aging of the Clone Troopers.
Now, I do have another theory that is similar to this in order to comfort those who worry about the Bad Batch's presumed short life, such as I. Perhaps, their super accelerated aging only occurred when they were still in their tanks being matured by the Kaminoans, and that when they were fully developed into the appropriate age, which is in their 20's, the Kaminoans halted their quick aging and then let them out to now do the missions requested by the Republic.
So anyhow, whatever the case is for these charming Clones, I hope they'll still live their lives to the fullest. Because in reality, life is truly short, no matter how quick you age. May the Force be with you, soldiers!