airtaxiwannabe,
I used to work for AirMed myself, and can tell you that the flying I did there was some of the most enjoyable of my career so far. They are a very good operator and treat the crews well.
"apruneUK" seems to have had a bad experience with air taxi work (or a misconception about it) as I never endured such faulty equipment as he described and the pay was very good, and certainly more than an FO with most UK airlines.
As for age, 33 is certainly not too old to start a commercial career in my opinion and I wish you every luck with it
