All perfect praise be to Allaah, The Lord of the Worlds. I testify that there is none worthy of worship except Allaah, and that Muhammad is His slave and Messenger.
The ruling of all kinds of insurance is mentioned in Fatwa 81425. As the ruling of mutual funds which are established for the purpose of insurance and to cover disability or death cases; these rulings are mentioned in Fatwa 86689.
Paying a fixed amount to a company on the condition that it will pay him back all the amount he paid after a certain period, along with an extra amount as pension after 55 years, this dealing is not allowed. If he pays the amount to buy shares in this company, then he becomes a partner, and fixing a portion of profit for a partner is not allowed rather a partner has to share in profit or loss. Moreover, a guaranteed profit is also prohibited. If the amount paid to the company was a loan and not a form of partnership, then it is a loan which leads to a benefit and any loan that produces benefit is Ribaa.
In addition, it could also become a type of gambling if the company conditioned the presence of the person after 55 years as due date for taking the amount.
Allaah Knows best.