Absolutely go for it! Go do a trial flight and see if you like it, you would be surprised the amount of people who go up and realise its just not for them! You are going to be stuck between a rock and a hard place.. If you go modular it will allow you to keep the business ticking over but it will take longer and you are looking at being 34 or 35 when complete...going intergrated will have you ready in ~12 months but you may have to sacrifice the business or family commitments. Being in your mid 30's with a CPL an airline job is definitely not out of the question, you will still have 25-30 years flying ahead of you. Don't give up on the dream, go for it! Best of luck!