I was 10 when my parents stopped hiding Easter eggs to hunt for myself.
However my parents continued to hide Easter eggs for my siblings and cousins to hunt when they were younger but I just stopped having interest in hunting Easter eggs when I turned 10 years old.
Although I did still get an Easter basket with candy and gifts in them well past 10, which I still enjoyed, but the Easter egg hunt part I just grew bored of.
You can hunt Easter eggs no matter what you're age, but some kids grow out of it and stop on their own by age 8 to 10 years old and some continue and some kids might stop hunting Easter eggs earlier as it depends on the kid.