If the defect or condition in the house is more than five years old, does the seller have to disclose it? YES!!!! Just because a defect is "old" or happened more than five, ten or fifteen years ago does not excuse the Seller from answering "YES" on the Seller's Disclosure Notice.
The Seller's Disclosure Notice is required by the Texas Property Code, Section 5.008. It does not mention anywhere that the condition or defect, say "Water Penetration", is only disclosed if it occurred during any time period. There is a reason for this and that is because even latent or dormant conditions or defects can reappear and because as a buyer, you deserve to know everything you can about a house.
So there is no Statute of Limitations on disclosing defects and conditions on a Sellers' Disclosure Notice.