My Croton Is At Least 38 Years Old. Is This Unusual?
The plant has not increased in size over many years
Certified GKH Gardening Expert
That depends on the exact type. Those known to have ancestry in harsh regions tend to have very short lifecycles, where those with ancestry in mild places tend to have longer lifespans.
It seems that the entire lifecycle can't be well studied, due to the drastic variation between species.
That is a good life, though. That is quite a long time for this Genus in general.
Here is a collection of articles that will give you more information on the plant: https://www.gardeningknowhow.com/category/houseplants/croton