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Let's start by determining John's current age. If we don't know John's current age, we won't be able to find the age difference between John's mother and John.

Let's assume that John's current age is x. According to the problem, John's mother is older than John by twenty years old. This means that John's mother's age is x + 20.

Now, let's fast forward twenty years. In twenty years, John will be x + 20 years old (his current age plus twenty years), and John's mother will be x + 40 years old (her current age plus twenty years).

To find how much older John's mother is than John twenty years later, we need to subtract John's age from his mother's age:

(x + 40) - (x + 20) = x + 40 - x - 20 = 20

So, twenty years later, John's mother will be twenty years older than John. This is because the age difference between them is constant at twenty years (since his mother is always twenty years older than John).