Can i transfer my cpf OA money to my son's OA when he turns 25?

The scheme that allows CPF transfer from a person to another, Retirement Sum Topping-Up (RSTU) Scheme, is to parents/grandparents and into their RA/SA account. An alternative is to do voluntary top-ups using cash.

For myself (20), I feel that unless there are special circumstances involved, we should not receive significant aid towards buying our housing. That will allow us to work towards our own goal with a sense of accomplishment at the end. If he is not intending to marry, then he still has more than a decade ahead to build his capital.

Another possible way could be with helping with furnishing the home after he buys his house. That would be an indirect way of helping without directly contributing to buying the house.