Thinking about one's own mortality is a bit - well morbid. But it doesn't have to be.
There is an exercise, which I have done, which can help you determine how you want your future to turn out. Write your own obituary. You don't have to keep it or leave it in your will. (Even though I do know someone who did.) Here are a few rules you can use to guide your way.
#1 - You can write whatever you want. You're the only one reading it.
#2 - Answer this question. What do you want to be remembered for?
#3 - Grammer, spelling punctuation don't count. Unelss yo'ure jsut OCE taht way.
Job 14:5 Our time on earth is brief; the number of our days is already decided by you.
One of the neat things about being a follower of Jesus is that there is a beginning and an end to everything. There was creation, and there will be a new heaven and new earth. We are born, and we will die. But the one thing that most of us don't understand about God is that the end isn't the end.
When we leave this world, we will live with Him in another.
When divorce or death destroy our world, God can give us a new one.
When time runs out for us, it has not for Him.
What is my point? You're not too old. It isn't too late. You're not set in your ways. Yes, you can change. There is hope.
After you have written your obit. Take a few moments to see the gap between your present self and the person who you want to be. What are you going to do about it?
PRAY: Dear Jesus, you know how many days I have left in my life. What do you want me to do with them? AMEN