Change is always scary, especially if it's not something that you are used to in life.
Talking combined with open and honest communication is the best. Self-awareness is powerful - how can you tell you partners what you want if you don't know yourself?
Be open to things not going precisely as you imagine - understand which elements of your ideals are important and which aren't so much. There are various tools available that can help you do this.
And your (or anyone's) age makes not one BIT of difference!
Oh, and welcome to the forum!
Please check out The Birdcage - an open, friendly Polyamory forum for all parts of New York State
"Listen, or your tongue will make you deaf." - Native American Proverb