By Section 7 of the Land Use Act, the child below 21 years cannot own a land in Nigeria. However, same law provides that you buy the land in the name of such child as a "trustee". This implies that, you can be in charge of the property on his behalf until he reaches majority and proper documentation will be done.

Barr Ayo Adeolu Aderinto

So, a child is from 21 years down
Na una know dey one wey be Legally... Go to owerri, a 19 year old undergraduate don buy over 5 plots of lands in highbrow areas.