No way that I know. If the main stock died, possible for new shoots to sprout making them new plants. Also how well it was grown compaired to how bad it was treated. Size doesn't always tell age. You know it is about 3 to 5 would be best guess. I have some that is over 40 years old and I see some almost the same that is 4 years old.
Sorry, I don't know of any growth rings in the plant base.
Stush

Agreed. If it's a pup from another plants' rhizome, it's technically as old as the 'first' rhizome in that line of propagation. Once it's sprouted, an individual rosette can live for decades.

Doubtful it came from a seed.

I ask myself this question sometimes. Including the 20 years I've had it, gramma's plant is around 80 years old. It's always been the same plant, continuously growing new pups, but all of the 'chunks' of it with me now are less than a decade old. The older rosettes were chopped up to propagate individual leaves, and mailed to other people in boxes, though none of those in the pot given to me 20 years ago were likely to be 60 years old...

I puts dates on my plants when received. If they are from a cuttting put a date on it as well. I have a S. rorida offset with a root tha I had removed a year ago, so it is one year old in July. it is still considered very rare. My plant was received 20 yrs. ago, Once it is removed from the mother and its on its own roots, that is when I start counting the day of it's birth, just like we count our children's age.