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Thanks for your question.
Actually there are two changes taking place as we age with respect to penis size.
One is the apparent decrease in size.It means that the fat at the base of penis increases as we age causing the penis to look smaller.
The other change is in the real size which may or may not be apparent and can be quite variable.Therefore with men who do not put on lot of fat with age the penis size may not decrease much.
Hope this answers your question.Please reply if you have any follow up question.
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