Don't buy normal trousers belts, instead buy elastic belts which can last literally for life
(i5.walmartimages.com)
As I said elsewhere, I bought my last belt from Hank's belts. 100 year warranty leather belt. That is a different style belt from the one in this topic though and so perhaps not what you want.
If you are looking for the style of this picture a web search for "lifetime warranty belt" finds several options that are this style - but since I've never heard of the company until they showed up in a search I cannot recommend any. Do some investigation on the company and decide which one to risk buying from.