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They may define "lifetime" as "25 years" or limit the warranty to the original purchaser, knowing that most people don't live in one house that long, or count on the later owners not realizing that there is a warranty, or knowing when or from whom the windows were purchased.

Yeah, there's a disturbing trend of products advertising a "lifetime warranty", only the fine print says that the "lifetime" in question is the "lifetime of the product", which is whatever the manufacturer says it is (usually no better than the competition).

Happened to my parents. Installer went under because the windows weren't as reliable as they expected.

These warranties typically only cover issues due to manufacturing. If your window fails decades later they'll just say it wasn't due for manufacturing.