Common life span for your whites tree frog?

[Stellasstar]

Hello everyone.
I would appreciate EXPERIENCED answers for this please! Google gives too many different answers and Id love to hear from pet owners.

Short story, my whites, Mud, passed away this morning and I am beyond heartbroken. He lived happily with me for 3 years and I found him this morning. I adopted him from a kindergarden classroom so I have no idea how old he was.

I am, of course, wondering if I could have done anything better. Google says they could live up to 20 years old but everywhere else I go to says 10 is the even age.
I just need to know I took care of him well and made his final years the best. So if anyone can tell me how long their whites lived I may be able to get a better idea of how old Mud was.

Sorry for the vent, I just lost a friend today and im devistated. Thank you all soo much for the help and advise. ♡