35?
If you just want the basics, the millennial age range is roughly 18-35 today. Millennials were born between 1982 and 2002. - https://thecollegeinvestor.com/19793/millennial-age-range/
It's one space, although I admit I usually will put two, as I was taught.
http://www.chicagomanualofstyle.org/qanda/data/faq/topics/OneSpaceorTwo.html
http://www.typophile.com/node/3466
This is what Kalifornia is becoming. A wussified version of the UK where would-be robbers sue when they fall through a window trying to break into someone's home.