My g-grandmother was Getrudes Caldera, married Vincente Castanon. Getrudes was born in 1864, in El Durasno. She had a sister Gregoria Caldera who was older than her, not sure how old.. She also had a brother, Julio Caldera who died at age 23, don't know if he was married or had children. Getrudes parents were Ambrosio Caldera and mother Marcos Arcalan.
My g-g-grandmother was also a Caldera, her name was Vicenta Caldera married to Blas Castanon. I don't have their birthdates yet. Vincenta's son (Getrudes brother) also married a Caldera. Rosalia Caldera married to Apolonio Castanon. Apolonio was born about 1860 so Rosalia would have been about that age too we assume.
We don't know if any of these Caldera's were related to each other or not! I have ordered microfilm from LDS so I should start getting answers soon. I'll let you know what I find. What names are you looking for and what dates were they born?