I'm 52. I retired ten years ago. At that point I had accounts that would cover each child's education, regardless of what they did, and would give them a big starter fund when they were starting a career. For a home, a startup, whatever. My house is paid off, and I have zero debt. Well, to be totally honest I pull a mortgage on my house. Every five years I negotiate a five year mortgage of about $5K. It keeps my property taxes low, and it helps to maintain my credit rating. We have enough tucked away that my wife and I can live until 110 and be okay financially. We both agreed that if we live until 110, we're going to throw ourselves into the abyss.
Having been "retired" for 10 years, I have a different approach for you all to consider. Upon first retiring I went hard-core on my property. I sold off all my rental houses, and used the money to establish a special place. Made a huge pond, stocked it with fish. Eat a lot of fish now. Pond requires some maintenance. Have a very big orchard. Have a ridiculously large vegetable garden. I grow huge amounts of food for my church's food pantry. At least a bushel of tomatoes every other week, for example. I built a wood working shop, a barn, an equipment storage building, and a few other odds and sods. All have electric, all have heat/cooling. I have a LOT of animals. I figured when I didn't have to work any more, I'd just hunker down and take care of the homestead, spend as much time with my wife and children as possible, and that would be great.
It good, not great. I have a dude I hire to help maintain the property, feed the animals, help keep up the gardens, blah blah blah. I enjoy that work, but I missed going to work, and interacting with other people. There was something missing. After I hired this dude to help take care of a lot of things here (I'm obviously still involved and I love all of that), I started to look back at flipping houses. It was a side thing I did for years to get to where I was at 42. It makes good money. So I'm flipping houses. There's a local realty agency who purchases a LOT of homes, remodel them, then sell them. They always have at least one project for me. I have a crew of the most unlikely misfits I'm able to employ. The house flipping is making me good money, I don't need it to, but it gets me out of the house, keeps me busy, and allows me to provide a good living wage for some people who need it. I have former felons working for me. I pay a good wage, and I get to go into a house and decide what walls to remove, what lights to put in, and to engage my creative side with my physical knowledge side. I employ people, I make money, new owners are delighted.
So for me retirement includes work. I know that sounds ridiculous, but I only work when I want to. I have others who can take over if I want to be away. Between my little "farm," flipping houses, volunteering with church, and my family I have a rich, full life. That's what I need for retirement. As I continue to age and my mobility/abilities wane, I can drop various things to simplify.
I have an issue with the thread title. I shall not grow up.