David is listening to his grandson tell him a story. He is finding that he is having difficulty following what his grandson is saying. When his grandson says, "I had fun," David thinks he said "I had sun." What is David experiencing?

Presbycusis                                    

Explanation:

Presbycusis: The term "presbycusis" is defined as the gradual process of hearing loss that tends to occurs in most of the individuals as soon as they grow older. However, hearing loss is generally a very common disorder which is connected with ageing and almost thirty to thirty-five per cent people with sixty-five years of age encounters hearing loss.

Symptoms:

1. Speech of another person's sound slurred or mumbled.

2. Difficulty in understanding a specific conversation, etc.

In the question above, David is experiencing presbycusis.

now you can mark brain hope this

giant impact theory - the moon was formed from the collision between earth and another mars-sized body.

colliding planetesimals hypothesis - the moon was formed from the same cloud of material as earth.

capture hypothesis - the moon was locked into orbit by earths gravity as it was passing by it.

accretion hypothesis - the moon was formed from collisions and combining of planetesimals.

i think this is right, if not and you know better let me know.