Pension

I cantracted (I don't understand this word) my personal pension yesterday. Because I'm not sure if I can get pension properly in spite of the fact that  I pay money to government every month.
In Japan, we are supposed to get it when we are 65 years old.But people say that pension age will be higher than 65 years old in the future.
The Japanese pension system has a problem.The pension that young people paid is received when they are over 65 years old.Japan has a problen with the declining birth rate and aging population.which means we might not get it,because the people that pay pension will decrease, people that pension receive it will increase. ( this sentence is unclear,I am not sure what you mean)
Even though I contracted personal pension,I am still insecure.I hope that the system will change.

I understand you.It is the same in many Western countries. I am lucky that I could take early retirement at 55 and I am not sorry that I did it.