You bring up a good point. When we're talking about wealth, we all seem to ignore age in the process. Age has a
huge impact on how wealthy you are.
If you're 25 and you have $2.5M? Yes, you're wealthy since you have 40 years of earning potential on top of your money.
If you're 65 and you have $2.5M? Very well off, but nowhere close to the 25 year old.
Same goes with inequality. If you ignore age, then things really unfair. How can someone have $3M and another nothing? But that ignore the fact that you'll have inequality regardless just due to age. It's not unreasonable for someone who is 65 to have a lot more money than someone who is 25. That's just the benefit of time.