Yes, we too don't have any real ties, that is, we are free to do whatever and whenever we wish.
We are both in our early seventies, retired and in reasonably good health.
However, we do lots of volunteering, as in collecting DGC from school/nursery.
The youngest DGC, who is one year old, I look after one day per week.
My DH helps our sons with technical jobs and advice.
We are not obliged to do these things but we enjoy it and they can manage when we're not here.
We go abroad to our holiday home when we feel like it so I too feel very lucky.
Like most people, we have worked hard most of our lives, lived within our means and I suppose we can say, now we are reaping the rewards.