Expectancy is a word that does serious analytical work. Life expectancy is the headline measure of population health and the number that drives pension policy, insurance pricing, and development comparisons. It’s one of the most cited statistics in existence.
The name fits a demographic research organisation, a public health body, an actuarial resource, a longevity research group, or a data project publishing population statistics. The .org is what almost every organisation in that space uses, and it signals research rather than product.
The longevity sector is worth noting separately. There’s now substantial private money in ageing research, and the organisations forming around it need names that sound scientific rather than promotional. This one does.
A second reading exists in psychology, where expectancy theory is a well-established framework in motivation and behaviour research.
One word, precise meaning, no plural problem, and it names something every country measures.
The name is listed. Offers welcome.