If you can take care of your kids and you don't act like you're 15 age doesn't matter at all. Good luck mama. You may get an u/s at every apt. My OB thought I was having twins my first apt. And told me I'd be getting an U/S to confirm I was like already? She said I'd be getting one pretty much every time if I were with twins. I was not. Thank goodness It's my first. I need to know what one baby feels like before having twins good luck.
Congrats and welcome to the twins club There is a thread on here called "Pregnant with Twins" you can join to chat with other twin moms about any questions/concerns.
Good luck! What type of twins are you having? I had identical (mo-di) girls in June.
I had my b/g twins at 22. I am now 26 and pregnant w/ #4. Other than morning sickness, I had no complications with the twins. I delievered them at 36w6d via csection due to one of them being breech. They both measured within a few ounces of each other at each ultrasound which I had pretty much every appointment since they wanted to monitor them to make sure they were both growing at the same rate. They both had approx. the same heart beat. I agree, don't read all the stuff that can go wrong. You will terrify yourself.
I had B/G twins at 18, and having #3 in the next couple of weeks. I'm 22 =) My pregnany went perfectly fine, and my twins NEVER measured the same. Even now at 4.5 my son is 10 lbs heaver and 3 inches taller than my daughter. You'll be fine mama.