Yes and no.
The fact that you're 15 isn't really a problem. But you said for a decent job during college, and I'm assuming that's 3-4 years down the road. A few employers may nitpick that your certification is so old (IE no Vista knowledge, etc). But to be honest they should be few and far between.
Also depends ALOT on what you consider a decent job. A+ never really netted me a job higher than 10-12 bucks an hour.
I recommend, get the A+ done, and work on a few more certs over the next couple years such as MCSE's and such, then you'll be prepped for a good job.
Good luck
