All you need to do is take the LSAT (only offered on paper and a few times per year) and then put together an application on LSAC. Applications for the next cycle open around September 1, 2018. I'd recommend an LSAT prep course or at least some practice tests.
Your age, while not common, is definitely fine. And engineering is viewed favorably.
Your odds will be based on GPA + LSAT primarily. So get a high LSAT. Aim for 170+ if possible. Your GPA is excellent.
Steps:
1. Make an account at
https://www.lsac.org/.
2. Sign up for LSAT and take said LSAT.
3. Get application components (letters of rec, official transcript, essays, etc.)
4. Apply. I would recommend next cycle, 2018-2019, starting September.
So you have a good timeline. Everything is centralized through LSAC.