Hi tubed4evr,
Any type or blend of latex is a high quality and durable material relative to other types of foam materials and while 100% natural Talalay may be a little bit less durable than the blend … it’s not something that would concern me no.
While there is no way to quantify how long any mattress will last for a specific person or predict exactly when you will decide to replace it because it is no longer suitable or comfortable for you (because this is the only real measure of durability or the useful life of a mattress that really matters) because there are too many unknowns and variables involved that are unique to each person … if a mattress is well inside a suitable comfort/support range and isn’t close to the edge of being too soft when it is new (see post #2 here) and you have confirmed that it meets the minimum quality/durability specs that are suggested in the guidelines here then it would be reasonable to expect a useful lifetime in the range of 7 - 10 years and with higher quality and more durable materials like latex or higher density memory foam or polyfoam (in the comfort layers especially) it would likely be in the higher end of the range or even longer and the chances that you would have additional “bonus time” would be higher as well.
A component mattress also has the advantage of being able to replace just a single layer if one of the layers softens or breaks down before the others (usually the softer top layer) or if your needs or preferences change down the road without having to replace the entire mattress.
Phoenix