The various types of cells making up the structural composition of your body (skin cells, muscle cells, cells of your stomach lining, etc.) are all Epithelial cells. The only other class of cells in your body are Gametes (sperm and egg cells).
Youngest to oldest would be: 3, 4, 1, 5, 2. Since it's from the bottom, the ones furthest from the bottom would be the youngest at the top. The oldest fossils would be closest to the bottom.
