Coco There are plenty who have left it much later and still have success. Under 30 is considered "young" these days!!
DH and I have been trying on and off since Dec 2011. Officially TTC Sept 2012 and started our IVF Journey in April this year. Ive tried "not trying", BBT charting and now IVF. So its been a interesting ride. Im sure yours wont be so eventful!