What the heck is "Thanatology"?
    Thanatology is the study of death and death-related issues. The word itself comes from Greek mythology.  Thanatos was the personification of death and the god of death (His Roman mythological counterpart was Mors).
    Thanatos was the son of Nyx (Night) and Erebus (Darkness) and twin brother of Hypnos (Sleep). 
    (This works for me:  I have a twin brother!  See the fun Below!)
    In early accounts, Thanatos was perceived as a powerful figure armed with a sword, with a shaggy beard and a fierce face.  His coming was marked by pain and grief.  But in later eras the transition from life to death became a more attractive option, and Thanatos came to be seen as a beautiful young man, sometimes depicted as a winged boy, much like Cupid.  Another portrayal of Thanatos was as a young man carrying a butterfly (the ancient Greek word for butterfly was psyche which in modern Greek means soul).

2 days old, John on your right
Hold on! About age 2
John on your left, 6 weeks old
John's ahead! almost age 2
20 months
20 months