Hi lilly,
I think you may be getting some misinformation here.
You can read more about latex allergies in post #2 here but almost all latex allergies are contact allergies and are connected to dipped latex (such as gloves, condoms, balloons etc) not to the foamed latex that is used in mattresses.
I’m not sure where this information is coming from but it’s certainly not correct and latex is among the most durable of all mattress materials. If anything it’s renowned for its ability to resist impressions and softening. You can see an example here of a latex mattress that was used for almost 50 years.
Phoenix