Question: I'm a 20-year-old in my second year of community college. I will be graduating next year. I have never taken my SAT's, and I'm worried that this is going to hurt me in the future. Whether it's going to a new school or a job, will not taking them affect anything serious? And can I take the SAT's now? I regret not doing them.
For better or worse, you are never too old to take the SAT's. If you plan to transfer to a 4-year college, it's possible that some of your target schools will need SAT results (or ACT results, which are also accepted wherever the SAT is required). BUT … many 4-year colleges do NOT require test scores from transfers, especially those who have earned an Associate's degree. And even if you do submit scores, your community college course selection and grades will play the starring role in your admission verdicts, not your test results (unless they are so bad … or so good … that they wave a big red flag).
It is also likely that your current school has an “articulation agreement" with one or more 4-year institutions. Such agreements either guarantee or at least facilitate a transfer for community college students who have fulfilled certain requirements. Typically these requirements include maintaining a specified GPA and taking prescribed courses (often some English, math, science … the usual suspects). So, you should talk to a transfer counselor at your school, if you have not done so already, to find out about existing articulation agreements. If any of the colleges on this list interest you, check to see if SAT's are mandatory.
If you want to give the SAT a shot, sign up here: http://sat.collegeboard.org/register/how-to-register But I wouldn't recommend taking them unless you need to … so check first.
As far as your post-college years go, there is absolutely no reason to take SAT's. Prospective employers will never ask for them (except, perhaps, if you're applying to be an SAT prep coach ;) ).