白松 is the name of the artist, and the reading of it would be one of the three; Hakushō or Shiromatsu or Shiramatsu. (Sorry, I meant Hakushō, not Hakushū, in my previous post.) Hakushō is a given name, and Shiromatsu / Shiramatsu can be both a given name and family name. It's impossible to figure out the correct reading only from the kanji.
I have no idea about the age.