Many creationists are old-universe while being young-earth, though. I recommend a class in geology and/or taking a high-level biology course (above the 100s)...
High school science education or just general entry-level biology college classes will NOT give a convincing evolution, and that is the kind of education the vast majority of the population has.
It's like... you go to the webpages that say man hasn't landed on the moon. Those websites are very convincing... unless your education tells you better. Same thing with creationism. They come up with a lot of statements and such that appear make logical sense, but they work on very little actual scientific base.
I can tell you that I was a very unyielding creationist until I went to college & found out that all the "proof" the creationists offer in all their books were honest distortions or misrepresentations and work from very little scientific basis. (One example is that they -all- confuse hypothesis with theory, which tells me they don't have much of a higher science education in first place...)
Good luck in all your endeavors, and despite what many will tell you, I do not think there is a conflict with taking Genesis as an allegory. Genesis means so much more than you'd think, especially when taking its historical context, but that's a subject for another day. :-)
Amend that to "general entry-level biology college classes will NOT give a convincing case for evolution"
It's not the age of the universe, or even the Earth, that I'm questioning.
What I am doubting is the belief that all life evolved from a common one-cell ancestor. This has never been proved. Some insist it has been. This emotional instance more than anything that has made me skeptical of it.
Actually, evolution has arguably been disproved if Gore3K's information is correct concerning the rate of observed mutations. If the time -- even assuming old Earth, old universe -- is not available to mathematically account for the development of life as we now see it, it seems it would be better science to doubt evolution.
Quick question: is time an absolute or relative method of measurement.