Hmmmm. Nice theory and one I shared until I retired. Then I realised that the car I drive to get to see family or even the shops or just to do the simple things I want to do costs money. True you could buy an old banger but it would be unreliable when you most need it and a few hundred quid to repair every time. So you buy a newer car but even that needs servicing, delapidates and needs replacing every now and then. New tyres ? That's £80 a pop right there. Car tax ? Insurance ? Petrol ?
Then, of course, there's the house you live in. True, you could live in a rented shed you've built yourself but if you have a half decent house that delapidates too. New windows ? Yup that's a few hundred more quid if you replace them one at a time like we do. Crikey, that council tax has gone up again.
City ? Sky ? Mobile ? Golf club fees ? fishing club fees ? Food ,? Electricity ? Heating ?
Actually, sod that, I'll take the dog for a walk. Ah yes, the dog. Monthly insurance premium (which has to be topped up because it never covers the vets bill), food..
As a poster said earlier, when you are planning retirement, carefully cost everything you need, then what you want to do, even if it seems simple, it's not as cheap as you think.
As for shagging, bear in mind your partner will likely be a woman in her 60s and you probably won't be that desirable a stud yourself.