Depends upon what you want to do or accomplish in retirement. There will be a work void, but it will also open up many possibilities that you never had time for or even thought possible. Staying interested and learning is key. Whether it is travel, or anything else - stay occupied and active. Research is a wonderful and satisfying pursuit as is many other activities such as volunteering.
One question is what do you want to do with income you receive in retirement? Pass it along to family or charity, maybe something else? If you have the means - retirement allows you to expand or improve upon your collections or go in a completely new direction. Much to consider.
Another question is when is enough, enough?