Even truely dwarf plants must grow. Trees don't reach a pre-determined height and then stop there--- unless they have started to die.
Dwarf plants simply have a slower growth rate. This is usually a combination of fewer growth flushes per year, plus much shorter-than-average flush lengths.
Examples: 'Julie', a true dwarf mango, usually grows 4-12 INCHES per year. 'Valencia Pride' mango, super vigorous, grows 3-10 FEET per year.
So we don't ask, "How tall does this variety get?"
We ask, "How tall does this variety get in 10 years?" [Unpruned.] 'Julie', 6-12 feet; 'VP', maybe 40 feet.
Or, we can ask, "How soon will I need to prune this tree?" 'Julie', 10 years; 'VP', next year.