Source: US Census. The median household income in the US is $50,502. This is some extremely useful data given that it is exploring over 114 million US households. If you want to know how most Americans are living this is a good figure to base your assumptions.
The myth that you have to wait 30 minutes or even an hour until you can swim after eating has been conventional wisdom for some time. The simple fact is, however, that swimming on a full stomach does not significantly impact your ability to swim.
A It is best to not eat for at least 90 minutes before your massage treatment and only a light meal at that time. The body needs time to digest your food. This is the same caution you would take when you go swimming or exercising.