Not capping life expectancy artificially and not artificially working to extend it for everyone. The world got along fine from 1800-1900 with the world average life expectancy existing at less than 50, but there's no guarantee of the same being true at a global average of 100. IRL everyone alive now exists in a tenuous situation where one of the key constraints is Earth's finite resources. Everyone can't have everything everywhere at the same time while living to 100 unless the population stays artificially low.

*https://ourworldindata.org/life-expectancy