Yes. While it’s not the usual situation that someone in a younger generation gives gifts to someone in the older generation, there’s no tax rule barring this. In fact, under tax law there’s no bar to gifts being made by minors.
A retirement plan that meets tax law tests and allows for tax deferment and tax-free accumulation of income until benefits are withdrawn. Pension, profit-sharing, stock bonus, employee stock ownership, and Keogh plans and IRAs may be qualified plans.