Capability is not fixed merely because it currently feels consistent.

Something that has been the same for years starts to feel like a fact about you rather than a result of your circumstances. But consistency usually reflects a consistent input, and if nothing you do has changed, then nothing about the result would be expected to change either. Stability is evidence about your habits rather than about your nature.

Before accepting a long standing limitation, ask what you have actually tried differently. If the answer is very little, the consistency proves nothing yet. Change one input properly for a season and see whether the constant holds.