As the other girls have said you definitley not too old @ 31. I concieved Declan when I was 31 (I was 1 month off turning 32) and it only took us 2 months to concieve him. Those realtives of yurs should learn to keep their mouths shut when it come to you TTCing and your age. There are plenty of people that wait until they are in their early 30's to TTC their first child and no doubt found it easy to become pg and had an uncomplicated pregnancy.

Good luck when you do decide to start TTCing.