I am considering the priesthood, but I am unsure of what steps that are involved in the process.
First, get a spiritual director.
Second, contact some vocation directors.
Is there a selction in the type of priest you want to become, or rather are all priests the same or are there different types?
Yes, there are two types of priests, secular (diocesan) and religious (members of religious orders).
You need to discern whether you feel called to the diocesan or community life.
How is education at the seminary? Is it a 4 year process like college?
Seminary education is graduate work. It is a 4 year masters degree program. You end up with a Masters of Divinity. That is if you attend an accredited program. Some religious orders have their own seminaries that are not accredited and I believe that you get a JCL or something like that, it is a pontifical degree. Same would go if you went to Rome with a religious order or diocese.
Are there things I must do to prepare myself.
You need a bachelors degree and the new requirements for seminary entry are 30 credits of philosophy and 12 credits of theology. The bishops are also recommending Spanish and Latin. Neither are hard and fast requirements but some seminaries may require the Latin.
What happens to a priest who is 80+ years old?
You will most likely be retired for a couple of years. How that works depends on if you go the secular or religious route.
I am 19 years old, can I pursue the priesthood at this age?
Yes you can but some religious orders may tell you that you will have to wait a few more years before entry into the postulancy/pre-novitiate.
Those are my main questions, but I am also interested in knowing others experiences in how they became a priest and the steps the took. So please share anything that might of interest.
I contacted many orders and went on some retreats with them, mostly “come and see” vocation retreats. I also did a “come and see” retreat at a seminary. I finally settled on the group I did after many stops and starts. Chose the Carmelites because I knew a couple of priests who were in the order.
I hope this helps you out.