If I failed my community college technical algebra and trigonometry, could I still become an engineer?

First off you are NEVER too old to pursue something that interests you! If you find something interesting or exciting and it perks your curiosity you should definitely go after it no matter what age you are. When I was in college there were many people in my engineering program that were much older than you finishing their degree in engineering. So don't let that be the thing that stops you!

I also started my college career at a junior college. At my JC they had us take an entrance exam to help us be placed in the correct classes according to our abilities. I was placed in basic math. Here I was an engineering student and I was relearning how to add and subtract all over again! I started to question my goals and wondered if I was really capable of what I wanted to do. As I went through my classes I started to see that there were some really basic concepts in math that I had not learned growing up. Which left a big gap in my abilities. I kept learning and going through the classes and finally ended up in the calculus class. It was HARD! I failed calculus... I felt terrible and I felt like I was not going to be able to pursue my dreams of being an engineer. But I retook the class. I made friends with the people in my class and we formed a study group. I found a tutor to help me once a week and I made it through the class. I ended up finishing college with a degree in civil engineering.

What I have found now that I have worked in my field for a while is that doing the actual math is only a small portion of my job. Even though I got better at the math... I have a whole team around me to check the technical work and make sure I didn't make a mistake just like I check their work for mistakes as well. Just like my study group we all help each other. I think engineering is more of coming up with the idea or seeing "what could be" instead of "what is" and then backing it up with the math and science. 

My advice is to keep pursuing engineering if that is what interests you! Don't give up! Retake this class and find out what concepts you may have missed this time around. Form study groups with people taking the same class to work on homework and study for exams. Talk to your instructor or go to the math department and see if they have anyone they would suggest to tutor you in this class. Math dyslexia is tough but not impossible to overcome. I work with a gentleman who struggles with math dyslexia and he just passed his PE exam. You just have to slow things down and take your time. Just know you are capable of doing whatever you set your mind to. You get to decide whether you succeed or not!