Getting married at a young age won't make you poor.Having kids at a young age will make you poor for sure.
I don't know about your country,but rising a kid from it's birth to the age of 18 costs more than 150,000 USD in the USA.The cost might be lower in the other countries,but it's still a significant amount of money.
Yes, marriage at young age doesnt make you poor same with havung a child at young age,if and onlh if you are willing to work harder for you and your family having a kid will never be a hindrance for a person who are determined to become successful in near future, we become poor because of lack of educational attainment which is required for you to have a job who offers a better amount of wage.