I think if you want to wait until 30 to have kids then you should! Do not let anyone tell you when you should be ready, only you know that
Now for my opinion LOL I feel that 30 is too old....but thats just me. I took the route where my kids will be 23, 16 and 15 by the time I'm 40. I didn't want to have a 10 year old at 40. my aunt is 45 with a 5 yr old and she loves it..you have to do what works for you

as far as the risks that are involved its mainly after the age of 40. I mean there are risk even at 20