heat barely degrades consumer pc components, and certainly not on timescales dominated by Moores law.
Old doesn’t mean heat abused. Gaming laptops or ones with discrete GPUs often have issues and it’s always because of the GPU. If it posts it doesn’t mean that the GPU won’t die soon or is problem free, gaming laptops have the most heat abuse and are constantly dying and having issues. Performance degradation because it’s old is a different claim from saying heat damage doesn’t exist.