All the things you think you would enjoy might not hit the spot at all when you will retire.

Learned that when took 2 years off work.

Yea. Having a purpose and bonding with other people on the way to achieving it are underrated elements of being working age.

If you're not conscious about it in retirement, it's easy to just do nothing, waste away, and find out many years too late. You actually need different ingredients to feel satisfied.