You'll never know til u try I'm 33 had been on the pill for 13 years and now have a 6 month old DD. Got pregnant fairly easily. Some struggle to conceive and some don't. I really don't think you're too old!!!
You're right to be prepared that it might take ages, or even may not happen for you. You have to have your eyes open and recognise that ttc can be a long long road.
On the other hand, I can count on two hands the amount of times I've had unprotected sex, and I'm currently 15 weeks with my second (I was 17 first time, 31 this time). We were really enjoying trying but conceived first time!
So be ready for either scenario, or something utterly different inbetween!