docs: update speaker bio

src/utils.ts

@@ -1,5 +1,9 @@
+import { differenceInYears } from 'date-fns';
+
 export function getSlugFromFile(file: string): string {
   const parts = file.replace('.md', '').split('/')
 
   return parts[parts.length - 1]
 }
+
+export const numberOfYears = differenceInYears(new Date(), new Date(2007, 0, 1));