system
Given the following post, respond as if you're commenting on Reddit:
human
[Star Wars] Why accelerate ageing by only twice the natural rate?

Especially as the Clone Wars raged on - and leading to a great number of soldiers dying. Is it some kind of a compromise value? 

As in, any faster and the clones would be old men before you know it; too slow, there would be a great net loss of clone troopers. Was it because of clone instability - whether the instability was mental and/or physical? 

It seems to me that twice the natural ageing rate seems far too slow against an army that can produce so many, in such a short period of time.
gpt
Probably because of stability, in part, and maybe simple physical limitations. The Kaminoans are scientists dealing with genetic engineering, not gods or magicians - they clearly have some limits. Otherwise they'd just make clones that grow in a day and stay at peak age for years.