Although not a lot some people who have had ana reactions in the past can outgrow their allergies.

In the Annals of Allergy, Asthma and Clinical Immunology in July 2013, found that 3,188 children surveyed currently had a food allergy, while 1,245 had outgrown one. Key findings of this FARE-funded study include:

A little more than a quarter of the children—26.6%—outgrew their allergies, at an average age of 5.4 years old.
Children who were allergic to milk, egg, or soy were most likely to outgrow their allergies. The likelihood of outgrowing shellfish, tree nut, and peanut allergies was significantly lower.
The earlier a child’s first reaction, the more likely that child was to outgrow the allergy.
Other factors that contributed to outgrowing an allergy included having a history of only mild to moderate reactions, being allergic to only one food, and having eczema as the only symptom. Conversely, children with severe symptoms (trouble breathing, swelling, and anaphylaxis) and multiple food allergies were less likely to achieve tolerance.

Black children were less likely to outgrow their allergy than white children.
Boys were more likely to outgrow their allergy than girls.
Dr. Gupta and her team conclude that, while more studies over longer periods of time are needed to confirm these findings, this data can improve the management of food allergies and aid in counseling food allergy families.

I grew up with several anaphylaxis allergies. I outgrew my egg allergy, but retained the rest. Sorry I don't have a better answer. However, I'm 27 and they know way more about this stuff now than they did when I was growing up.

That's great that you at least out grew the egg. Just out growing egg would be amazing for my little man x

Just thought I'd pop a little update on here my son now has 5 more allergies 2 are ana (sesame and haricot beans) but we scored zero for egg on our skin prick this week so we are starting to reintroduce baked egg 😃. the allergist is certain he will outgrow his milk allergy too which is his most severe ana allergy so I'm feeling pretty hopeful at the moment.

My son who has peanut allergy has been tested at 18 months and 5 years and had not outgrown his allergy. He will be tested again when he's 11. I was informed by the allergy doctor that only 5% grow out of nut allergy😟.