What Taleb meant is that the longer something survives the more robust, or anti-fragile it tends to become. But I don't think that meant an eternal half-life.
Taleb specifically addresses robustness vs antifragility and they shouldn't be used interchangeably
Robustness is static durability. A concrete wall is more robust than a wooden fence. However, on a long enough timeframe, shocks large enough to destroy both structures are guaranteed and they have no mechanism to adapt, so they will be destroyed. The more robust structure can be expected to last longer. However, small shocks to the system won't improve it's expected duration. Intermittently hitting your concrete wall with a hammer won't improve its life expectancy.
Antifragility is a property of systems that specifically gain from disorder. Antifragile systems must have mechanisms for repair and adaptation. Biological evolution is the example. The culling of unfit individuals from populations by prior shocks to the system actually increases the resilience to unpredictable future stressors. Bone density is another example. Small shocks to your bones through controlled weight lifting will decrease your chances of long bone fractures to larger stressors.
Lindy does not mean bitcoin will only live another 10 years. Nor does it imply a symmetrical relationship (as is being suggested above). The most common example of the Lindy effect is in actuarial life expectancy tables. Your life expectancy is SHORTEST at birth. Every additional year you live, your life expectancy increases. For men in the United States, your life expectancy is 75.4 at birth but increases to 79 at age 50. Saying a male who lives 10 years is expected to live another 10 is a gross misunderstanding of the concept. Lindy simply means the life expectancy grows with time, by some unknown factor. Lindy applies most directly to memes, and has no application to strictly perishable good. Humans are partially perishable, so obviously, the lindy factor is much lower than for art or technology.