I was born in 1984. Ronald Reagan was president from 1981 until 1989. George H.W. Bush was president from 1989 until 1993. Bill Clinton was president from 1993 until 2001. George W. Bush was president from 2001 until 2009. Barack Obama has been president since January 20, 2009.
for 16+ years of my (soon-to-be) 25 years of existence, I have lived under a Republican president; this is compared against only 8+ years of living under a Democratic president.
Note: I've only had the legal opportunity to cast my vote for president twice in those (soon-to-be) 25 years.