Teen with an older man

Hey I'm almost 18 and am currently in a relationship with a 26 year old man, we have twin sons together, who are almost 2 years old, he is an absolutely amazing father to them and an amazing boyfriend to me, but lots of people say it's a very bad choice, what are your opinions ? 
I have been given so muc grief about it, I just need other opinions, thanks :) 
(I was 16 when I fell pregnant) yes I know that is absolutely horrible, it was an accident, but that's besides the point