The ages of people who have won the Nobel Prize in Physics varies. Marie Curie was was 36 in 1903 when she won the prize. Albert Einstein was 43 when he won the prize in 1921. Raymond Davis Jr. was 88 years old when he won the prize in 2002. Age is not one of the criteria that must be strictly met in the case of the prize.
Instead achievements are looked at. Some people have won at very young ages while others have not won until they were quite aged. Either way it is a big honor that most people never receive no matter age.