Thank you for asking this question.
With age, it happens that we often become preoccupied with certain thoughts, but trying to stop them will only make them more troubling, what we should wish for is controlling them and learning how to deal with them. A simple trick to check if the thought you're having is rational or irrational, look for proof, ask yourself: "What is the proof in my current surroundings that this would happen?", "If this turns out to be true, what can I do about it?". Understanding your locus of control, i.e, if you can change or control the outcome of that situation is also important, if the situation is outside your control, worry will not change anything.
I hope this helps you.
Next Steps
Reflect on the thoughts
Health Tips
If things still feel overwhelming, it would be advisable to talk to a therapist.