Texas Over-65 Property Tax Cap

I have a home in Spring I would like to leave my spouse and son (50%-50%). My property taxes are currently frozen because I am over 65. My question is, if I leave the house to someone that is over 65 (my spouse) and my son (who is 47), do they still qualify for the property tax freeze? or would it only remain frozen for the half co-owned by my spouse?

Thank you

Note: It has to be owned 50%-50%. That is not negotiable