Overpopulation. An eternity of Trump running for president again. Countries saddled with dictators who never die.
We'd have to solve a whole lot of other issue, of the kind we're proving incapable of addressing right now, without the benefit of having the old guard die off and giving a new generation a chance. Plus, all the fucking extra amount of people putting more load on an already strained ecosystem.
We'd have to implement Carousel, but good luck with that: it's already almost impossible to evet get a senile senior's licence revoked in the US.
Developed countries often have flat or negative population growth. Even so[ the population of the US is still growing; we gained 1.2 million people between 2020-2021. However, it doesn't matter, because most of the peopl in the world don't live in "the West". There are 300M people in the US; India, alone, has a population of 1.4 billion. India's population grew by 11.2 million in 2020-2021.
Yes, we have Trump. But someday, we won't. We won't have Putin, or Kim Jong Un. Old age, and death by it, doesn't guarantee that a country's leadership will get better, but for some populations it's their only chance.
And yes everyone isn't in the west but eventually they'll be developed nations too and then people have less children.
You'll have another Trump of Reagan or whatever anyways, it's a democratic problem, not something being old solves. Doesn't stop either if the two USA pretenders eh.
Curing aging doesn't make people immortal or something, it just cures that particular disease. Like we have cures for lots of other diseases.
Japan is not in "the West." It also has a relatively small population; it's only a third of the size of tye US, and less than a tenth of either China or India. Germany's population is flat, but it's even smaller than Japan. France's population is growing. Spain's is declining slightly, but its even smaller than Germany - half the population size! Overall, the total rate of population change in the combined EU is a fraction of the number of new people the US added, and a drop in the bucket compared to the total growth of the overall World population.
Were you suggesting that anti-aging technology should only be available to people in the wealthier countries? Because those are almost the only ones with flat or negative growth. If everyone has access equally, then there will be a population explosion and crisis, because the countries adding the most people to the world right now are also the largest - by orders of magnitude.