Most people can't imagine what a world without ageing would be like, and they can't want what they can't imagine.
Speaking personally, I'm motivated to cure aging for obvious reasons, but demotivated by the immense complexity of the task. To cure aging we need to essentially devise a way to remove most forms of decay from an extremely complicated system. Remove some forms of decay and other forms arise. The body has natural mechanisms to fight decay but the mechanisms themselves suffer from decay.
Another month, another rationality quotes thread. The rules are: