Is only locusts ok?

I saw this photo and realised my gecko has eaten nothing but locusts her entire life and she’s about 13-15 years old now. She seems very healthy and loves locusts and refused to eat cricket when one accidentally got in from the locust pack. If I get worms I don’t want them to grow into whatever disgusting bugs they turn into and invade, plus it would be sudden to just start feeding a new kind of food after all these years. Is only locusts ok?