Have you heard the saying "jumping from a frying pan into fire?"
You will be doing just that. Now you are in a frying pan. Your second marriage will have no legal standing so you may call it a marriage but it will not be a marriage. You can call this "event" or "ceremony" that you want to conduct by any other word. Also, the nature of romance in today's day and age is such that it is usually transient and one has to be prepared for the worst. One always has to ask the age-old question: "What if?" In your case, this question would be "What if my second relationship also turns sour?" Well, then a good advocate (albeit that term is an oxymoron, meaning contradictory, in itself) of your second wife can accuse you of RAPE. That you had s*x with your so-called wife knowing that she is not your wife and by misleading her into a false sense of belief that she was legally married to you. This is precisely covered in the Indian Penal Code. So, friend, love, shove bhool ja. Practically soch. Also, you should know by now that age is just a number. Do not be too bothered by this number if you are the energetic type. I know 60 year old men who have the energy (in every sense of that word) of 35 year olds and I know 30 year olds who are as lethargic as a 70 year old. Hope you get the point.
As for your advocate's advice, "the lawyer adviced me to settle down wid her with a secret marriage " it only corroborates what I have been saying all along that advocates in India are a bunch of illiterate and crooked morons and that LLB is equivalent to 12th standard fail. If you have a desire to take PRACTICAL advice from an educated person in India, meet a Doctor, a CA, a school teacher, especially from a village (the best in this list), a professor or engineer from a good college. Even advice from a sweeper (chaprasi) may be worth listening to. But never from an advocate! Logic? A chaprasi was most probably deprived of opportunity to study due to his family background. An advocate? He most likely became one because he failed to pursue any other profession due to a very low IQ.
This is my first and last post on your question. GOOD LUCK!!