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If your specific sliding glass door model is out of stock or no longer being built, it may still be best to contact the original manufacturer or installer. They can suggest a comparable replacement that is similar in size, avoiding more expensive repairs to retrofit a new door to an older opening. 

On average, sliding glass patio doors can last between 20 and 30 years. Their actual lifespan depends on several factors, including proper installation, frequency of use, and regular maintenance of the sliding components. While this is the typical range, minor problems and the need for occasional repairs or part replacements can still occur. Addressing issues as soon as they arise and performing regular maintenance will help extend the door's life. If the door is older and requires frequent or significant repairs, it may be more cost-effective to replace the entire unit.

Yes, prehung doors include a door jamb. Prehung doors are sold as a single piece with the door frame already constructed, including the hinges. The only part missing is the trim, which you add after fastening the door. They are more expensive than slab doors but are quicker and easier to install. Prehung doors come in an array of sizes, so there’s likely an option to fit any doorway you need.

Most modern, standard doors are 1 ⅜-inches thick, so you should aim for this thickness unless you're building a door to replace an antique door or fit into a non-standard wall opening. Thickness varies when installing a pocket door or sliding barn door, so a good rule of thumb is to measure your existing door, if possible. For standard doors, you can also measure from the inside of the door to the door stop to gauge the proper thickness.