“The expression of this gene led to the appearance of telomerase activity in the fibroblasts, elongation of telomeres (to the size characteristic of the embryonic cells), and immortalization.”
“While these results reveal some heterogeneity in the reprogramming process with respect to telomere length, human somatic cells reprogrammed to pluripotency generally displayed elongated telomeres that suggest that they will not age prematurely when isolated from subjects of essentially any age.”
https://www.mendeley.com/catalogue/telomere-dynamics-human-cells-reprogrammed-pluripotency/