Harold, who is 55 years old, did not realize how much his physical appearance had changed until he saw a picture of himself taken 20 years ago. harold's gradual change in physical appearance was due to

senescence

Explanation:

According to my research on the process of aging, I can say that based on the information provided within the question Harold's gradual change in physical appearance was due to senescence. This term which is also known as biological aging is defined as the condition or process of the body's deterioration with age.

I hope this answered your question. If you have any more questions feel free to ask away at .

american political culture includes a plenty of focus views and preferences. not all westerns experience the same opinions, of course, but the large preponderance promises to these general ideas, including equality, justice, freedom, individualism, integrity, and difference.

the united states is a democratic republic. residents elect representatives to governmental, nation, and local administration; those deputies create the regulations that command u.s. community. although emptiness in u.s. law needs it, in usage, the administrative system is ruled by executive factions.