I think it is never too late to take on any new vocation if it is dear to your heart.
The trick is to find something you really love and make it a vocation. It is very important to pray about this as much as possible. If I were inclined to pray for a vocation, I believe I would ask for the intercession of a doctor of the church such as Saint John Vianney or Saint Catherine of Sienna, Saint Theresa of Liseux, Saint Anthony of Padua or any of the other 29 or so doctors. Find one who resonates with you and your like and dislikes and ask for their intercession in Jesus name. I hope you find results soon. Let us know how you are doing. When you find doors opening for you, you have made the right choice. Prayer is key.