I am new to this industry like 'many', I am still slowly working through the course, and am also of a sightly more mature age. However I would think that this would be of an advantage in this industry, common sense, intuition, experience, people skills, communication skills, all an advantage and should be further advanced in the more mature investigator. Also, lets face it, how many posts have you seen from the young hopeful who has the impression that they will be undertaking countless dangerous undercover operations and think that an investigator is a mirror of Magnum PI. Also the multitude who think, "I will pay $700 and then have a carer" that's not reality. As far as I can tell, good people skills, firm grasp on English and comprehension, effective networking, some self promotion, patience, persistence, common sense, sound analytical skills, self discipline, a reasonable amount of intelligence are all required to find your way in this industry.
I suppose that realistically your geographical location may put you at a slight disadvantage. My advice is, if you are able, move to an area that is slightly more populated with a lower concentration of Investigators (the info is on the net). Work at a job other than PI and save some money, create a decent web site and advertise yourself. Get a few good contacts and sub-contract.
I see my position as more mature as an advantage, I also have a good profession that pays well, spending some cash on self promotion/advertising is essential as far as I can tell, get yourself out there. Having a few solid contacts to assist is also a huge bonus. I actually have emailed several investigators to assist with course questions, from that I have one in particular who is absolutely brilliant and has helped me no end with resources and advice, some networking contacts are priceless. How you present and represent yourself is important. Don't be afraid of self promotion I say, as long as you have the confidence in your ability to back it up. Oh yes, something I have noted, don't call your business Dick Tracy, Magnum PI, Sneaky Investigators. Blatant understated advertising in my opinion is great, flashy PI business names 'are not'.. You work in sales, 'Sell Yourself'. And as Mr 'BG' noted, 10 emails I am assuming is okay, I suggest it's what you do with them is important also. Good Luck
PS: I had some time on my hands, can you tell ?
Cheers: Eduard