33............... def not too old!
If you have the funds available go for it but just be aware that things are slowing a little on the job front.
Be realistic and include the fact that to expedite the process and get you back into a reasonable age/experience ratio you will be best funding a type rating. (£25-30k).
The lo-costs will take people age 40+ with min hours from both integrated and modular backgrounds, so long as you can fly to reasonable standard and will fit in with their train set.
Be very honest with yourself and if you conclude that you are very self disciplined then build your own modular training package.
Also as you are not 18 with a fresh sponge to fill, try to select one of the tougher, one-on-one schools, rather than a sausage factory.
Just a heads up for the new younger guys, I regularly fly with 25-26-27 year old captains, sadly reality has struck early, several of them have already come to the conclusion that there is no way they intend sitting in an aircraft cockpit for the next 35 years!
Have a real good think about it, network and get some real views. Commericial flying is not what it was 10-15-20 years ago. For many its about half as interesting (twice as many annual hours for the same pay as 10 years back).