AGE MAY INFLUENCE A LITTLE BIT but it will NOT be a career breaker..... What you can do is balance your age with somethinge else like experience.
I just met a guy who is in his late forties, changed his career & went back to flying. His childern are in College. He decided to return to flying for same reasons, he did not want to turn 65 & say, I could have been a PILOT. He had some experience flying a turbo prob but quit abt 15 or some yrs ago. He had to work hard to get back his proficiency but was hired without any issues in India.
If you choose to pursue flying as a career, you will have to do it fast enough to become a flight instructor in 2 yrs max. Flying Instructor route is the key to reach 1500 Total hrs to get an ATPL & then you are in a different catagory & age 35 does not apply. You may even be picked up by a corporate operator.
You are a mechanical engineer, so studying hard & clearing exams should not be a problem.
FOCUS on your TARGET is important & always REMEMBER, don't let anyone talk you out of your dream.....
So, the best advise is get a PPL first & then decide.