WordNet sense 1 (approximately the last 10,000 years):

Holocene, Holocene epoch, Recent epoch

WordNet sense 2 (of the immediate past or just previous to the present time):

late

WordNet sense 3 (not of long duration; having just (or relatively recently) come into being or been made or acquired or discovered):

new

WordNet sense 4 (belonging to the modern era; since the Middle Ages):

modern