should carpets be replaced every 10 years regardless?

[Mike Franco]

I don't wear shoes in my own house, so my 27 year old carpet is still in great condition.

On the other hand, I can put new carpet in a rental, and within 1 year, it will look 10 years old.

How do you decide a carpet is still serviceable vs needing to be replaced?

Do these carpets look usable?  https://i.imgur.com/Dr9mDGV.jpg

New tenants were wondering if they could replace it in the future. 
I am going with vinyl plank next time, and hoping they don't split at the seams or get too many ugly scratches.