Board Thread:Manga/@comment-7278867-20170312084406/@comment-31977586-20170511043643

i dont think that it depends only on the  number of times the user transforms.

zeke was turned into a titan at the mere age of 5-7. he is now in his twenties .also it is pretty obvious that he frequently uses his power .also it is hinted that he wanted to free eren ie wanted to show him something,possibly the reason for his longetivity.

i know his successor has been chosen but he has lived for more than 13 years with his power.

also same goes for grisha.