indexOf method in an object array JavaScript typescript

man thanks you saved me to accelerate my system <3

const guests = [
{name: 'John Doe', age: 30},
{name: 'Lily Bush', age: 20},
{name: 'William Gate', age: 25}
];


function indexOfObject( arr, key, value ) {
let j = -1
const result = arr.some(function(obj, i) {
j++
return obj[key] == value
})
if (!result) {
return -1
} else {
return j
}
}

console.log(indexOfObject(guests,"age","20"))