I just went through tons of photos taken of a baby named Bob during his first year. As new photos are added to the Library over the next year, I'd like to be able to somehow filter the Library based on the keyword Bob, but only have it show me photos taken since his first bday. Is there a way to sort based on keyword and a date range?
You can create a Smart Collection with keywords and Date ranges.
Technically, you cannot sort by keyword and year. You can filter by keyword and year.
There are two methods: a smart collection, as SeanMcFoto said, or you can use the Filter Bar. Probably smart collections are easier.