Wealth is whatever we will work for. Wealth is whatever we want.
The things we want most are love, health, freedom, etc. So these are the greatest wealth.
In an efficient economy, every person creates wealth: even the disabled.
Most wealth requires cooperation, and so money exists as a convenient way to exchange wealth. A happy, healthy, free person will create more money than someone else. So even happiness and health can be measured by money.
The enemy of wealth is theft. In a society that allows theft money loses its meaning. Because stealing wealth becomes easier than creating it. So money no longer reflects a person's skill at creating wealth, but only their skill at taking it from others.