Memory loss, saved or not

Hypothetical:

A person, 19 years old, comes to Jesus with an incredibly strong unshakable faith, fully dedicating their lives to Him.
Shortly after they are in a car accident and lose their memory from the past year.
They live a full life and pass away at age 90.

1 year of their life was lived as a true Christian.
70 years was lived without any faith or desire to come to Jesus.

Is this person saved?

God is omniscient. He knows everything! So, he would know that this person was going to lose his memory in a year. And certainly, if his heart is quickened this man will turn to Christ, long before he turns 90. Simply because the Holy Spirit would make it happened.

But, your whole question is utter nonsense! Following Jesus is not just head knowledge, but a heart that is changed. Memory loss cannot change the state of one's heart!

"2 You yourselves are our letter, written on our hearts, known and read by everyone, 3 revealing that you are a letter of Christ, delivered by us, written not with ink but by the Spirit of the living God, not on stone tablets but on tablets of human hearts." 2 Cor 3:2-4

26 I will give you a new heart, and I will put a new spirit within you. I will remove the heart of stone from your body and give you a heart of flesh." Ez. 36:26

"So then, if anyone is in Christ, he is a new creation; what is old has passed away—look, what is new has come!" 2 Cor 5:17

This is the real gospel! If God has changed his heart and made him into a new creation, then a lack of knowledge will not be a stumbling block.

Hypothetical:

A person, 19 years old, comes to Jesus with an incredibly strong unshakable faith, fully dedicating their lives to Him.
Shortly after they are in a car accident and lose their memory from the past year.
They live a full life and pass away at age 90.

1 year of their life was lived as a true Christian.
70 years was lived without any faith or desire to come to Jesus.

Is this person saved?

Is this person saved?

Memory loss cannot change the state of one's heart!

I've worked in the Alzheimer's unit of nursing homes.
Let me tell you something, the people there have NO IDEA of whats going on around them.
One day I was giving a lady her bath. She was 102.......
day to day she had no recollection of anyone or anything, even her own family that faithfully came to see her.
While bathing her I was humming old children's sunday school songs "Jesus loves me this I know"........
She recognized that even though I was humming (softly) and water was running (LOUD)
She asked me to sing it, so I did, she smiled and sang parts along with me........ her face lit up, the kind of light in her eyes that only the Spirit gives.......
then proceeded to tell me all about her childhood going to church with her family, spiritual things she had witnessed growing up.
When and were she was when she accepted Jesus.......
Little later at the breakfast table I mentioned some of it to her........
she could not recall her shower, or our conversation...........

What about those with multiple personality disorder?
I've heard occasions where one part of someones personality is Christian, and their other personality is atheist.

What about those with multiple personality disorder?
I've heard occasions where one part of someones personality is Christian, and their other personality is atheist.

Are you asking because you know someone personally going through something like this (in which case I would ask, have you prayed and sought the Holy Spirit concerning them)
OR
are you placing hypothetical thoughts out there to stir people up and sow discord?

Neither.
Do you have an answer or can you admit you don't know, because the question goes against the grain in Christianity.

Hypothetical:

A person, 19 years old, comes to Jesus with an incredibly strong unshakable faith, fully dedicating their lives to Him.
Shortly after they are in a car accident and lose their memory from the past year.
They live a full life and pass away at age 90.

1 year of their life was lived as a true Christian.
70 years was lived without any faith or desire to come to Jesus.

Is this person saved?

What about those with multiple personality disorder?
I've heard occasions where one part of someones personality is Christian, and their other personality is atheist.

Hypothetical doesn't always mean fiction.
Hypothetical's are given because they are possible.
The hypothetical's I gave do happen, even if I don't know them personally.

From my experience, people get upset with hypothetical's when they don't have an answer and it puts tension on their faith.

I quit speculating about another's salvation long ago. I know nothing but Christ and Him crucified. I find I must die daily for His sake. I am so busy working on this unholy human (myself)--I cannot speculate someone else's walk with Christ. I find it best just to encourage others to work on themselves and share what I have learned.