Prior to retirement I was in the field of education for a time as a teacher and finished as an adminstrator. Now I sometimes help out in a school, emphasis on sometimes. Sometimes do odd jobs for people from working on a farm to minor home repair, not to make a living, just to help them out and earn a few dollars.
Retirement has benefits, like choosing the day to fish or hunt, play golf, etc. instead of doing so on the days you have off. For the younger generation on here, I strongly suggest you start investing at a young age so when you want to retire you have a choice. Talk to investment counselors and you will find that if you take advantage of the tax benefits, putting $100 away every month does not equate to that $100 being deducted from your paycheck. Don't wait until you're 50 and think you will have more cash then. Start now. You are not limited to a stock portfolio, but invest in something that has a good chance of providing income in the future. Hindsight is 20-20 and I don't know what will happen with land prices, but when I first started teaching I could have bought land for about 10% of the current cost/acre. I could have also purchase gold for about $25/ounce. I convinced myself that I didn't have any extra money. Looking back it would have been a good investment. Investments require some thought and research but look into them.
Retirement also has drawbacks. After awhile you will not like waking up every morning and trying to come up with something to do. Have a hobby, volunteer, or work part time at a job where you can set the hours. Keep active somehow.
Finally, enjoy your grandkids, they will grow up to quickly.