Mean income for retirees aged is $103,000 and below [3]
So, the amount of money spent on a single largely meaningless war that the US is solely responsible for could easily increase the quality of life of quite a few people for quite a few years (if you don't dole out $140,000 in its entirety but spread in smaller chunks over the years or invest in infrastructure, medical care etc.)
Oh, if you meant to save the money spend over about two decades and use that instead to pay out retirement for one to two years, then sure. However, retirement lasts more than one to two years. One or two decades are more likely.
That’s probably more than enough to cover quite a few people in their retirement.