Why are vacuoles usually large in old cells?

The vacuole in the plant cell performs not only the function of maintaining the cellular shape and rigidity, but also serves as a place for the accumulation of various organic substances. Such substances are also cellular waste. The older the cell, the more waste it produces, so the vacuole grows. Another explanation is related to the fact that young cells are formed at the periphery of plant growth, and their maturation is associated with an increase in the turgor pressure of the vacuole (for example, the vacuole ensures the correct arrangement of chloroplasts in the columnar mesochill of the leaf).