Some GPUs may easily last more than 10 years of light use, but I am not aware of public data about the reliability of datacenter GPus, which would give the percentage of A100s that die during the first 3 years of 24/7 use and during the first 6 years of 24/7 use.
I doubt that many of the 6-year old A100s have been in use 24/7.
I doubt that many of the 6-year old A100s have been in use 24/7.