Welcome! I want to share with you that I have two sons, both are almost 6 years old. One son is a biological son who does not have thalassemia. Our second son we chose to adopt from China when he was 3 years old and we knew he had beta thalassemia major. So, now we have two sons almost the same age (2 months apart). We live in the U.S. where we have access to a safe and plentiful blood supply (vs. the blood shortage in China right now) and access to chelation. All the information from doctors and Cooley's Anemia Foundation (in NYC) is that with proper transfusions and chelation, along with annual tests and monitoring, a patient with thalassemia major should live a life (lifespan) very comparable to someone without thalassemia.
For us, having two boys (one with thal and one without), we see no difference right now in their activity levels, quality of life, etc. Our son with thalassemia misses one afternoon of school every 3 weeks to go for a blood transfusion (3 1/2 - 4 hour process for him). The next 21 days he appears (and we treat him) as a typical almost 6 year old child.
Nicole