1987年（33）

I worked as a system engineer and became the director of a management association in my community. I was enjoying a fulfilling work and private life.
I frequently visited the hospital due to tinnitus and unstable mental condition. After receiving a diagnosis that the symptoms were caused by overwork, I went to my parents' house to rest and recuperate. I subsequently returned to work but then took a leave of absence.

1989年（35）

I returned to work again, but was reassigned to a clerical position and lost my motivation to work.

1994年（40）

Seeking a purpose for life, I was baptized and became a Christian. Through activities such as volunteer work, I found joy in my life despite my worries about work.

1999年（45）

Noticing that I was making more mistakes at work, for example not being able to write meeting minutes well, I went to the hospital but was diagnosed as "nothing wrong." I continued to work but had a mental health problem. I took a leave of absence.

2002年（48）

I returned to work. I continued to work as a delivery clerk.

Diagnosis

2005年（51）

I lost confidence in my work because I was making mistakes such as leaving a cart at a delivery destination and being unsure that I had delivered the goods. I visited the hospital again, had a CT scan of the brain and was diagnosed with juvenile Alzheimer's dementia.

2006年（52）

After receiving the diagnosis, I took a sick leave. However, I resigned from work because I felt that I could no longer continue working. I lived a hellish life in despair.

2007年（53）

Hoping to continue living by myself, I was trying to find new ways of living and go out as much as possible. Then I met "Saisei no Kai," a family group for young people with dementia, which led me to meet a variety of supporters.
I started to give lectures about my own experiences of living with dementia.

2012年（58）

I served as the president of "Mittsu no Kai," an association for people with dementia.

2014年（60）

I founded and became a co-chair of the Japan Dementia Working Group.
I published "What I Want to Tell You as I Live with Dementia" (Otsuki Shoten). I later received an award for excellence from the Medical Journalists Association of Japan.

2017年（63）

At the 32nd International Conference of the Alzheimer's Disease International (ADI), I made a presentation as a co-chair of the Japan Dementia Working Group.
I founded and became the president of the "Association of Individuals Living with Dementia."

2019年（65）

I held an event called the "Piano & Talk Event to Commemorate the 15th Anniversary of Masahiko Sato's Dementia Diagnosis and the 20th Anniversary of His Onset of the Disease."