The older person has less fat than a baby. So this is going to influence the way that water soluble and fat soluble drugs will work. Older people also have less muscle mass too, so you've got to take that into consideration. And again, the water composition. This then brings us to probably the most important point when it comes to distribution,. which is something that Matt and I love talking about. The apparent volume of distribution. Now. What does this mean? All right. Your body has different compartments that hold fluid. These compartments include your intravascular. So your plasma, your extracellular fluid, the fluid outside the cells. But outside the vascular. Correct.