I am in the position that I did not really want to do childcare all over again but due to circumstances I have had to help out with my grandchild. My son-in-law is about to be made redundant from the factory he works in and that leaves my daughter the sole earner. Paid for childcare is out of the question. The other grandparents are already looking after grandchildren, so when my daughter had her baby, they were not willing to take on any more childcare (which I completely understand, but also admit I think their own children take advantage). They do watch their other grandchildren a lot. Don't get me wrong, SIL looking for work but it is not easy and there is far stiffer competition for jobs now, especially where we live.
I felt when husband and I retired we would go holidays but he then went back to work part-time and to be fair, he loves watching our grandchild and is a super grandfather. He now does not seem bothered by holidays, but I am lucky I can get him away in the UK twice a year and I know that is more than a lot of people have. I am left wondering what happened to our plans for an easy life, I do not think there is any such thing.
I try to keep my interests up and have a few niggly health issues but to be fair my daughter and her husband do not take advantage. My daughter did ask before she returned to work and is very understanding of the fact that we are older and I am not as fit, her and her husband do the bulk of childcare when they can. I know they would face real problems if I said I wasn't doing it and I just cannot do that. I love my little grandchild, decided to make the best of it and when she is a little older I have a list of places to take her and things to do. I am fortunate as I do not watch her every week, though some weeks we have her 3-4 days, thankfully no overnights. I am fortunate that my husband and I can manage things together and he makes sure that I am not left with the bulk of the childcare. I have not felt 'held to ransom' or anything like that.
I think a bit of me resented the fact that when my children were young I had wanted to return to work and husband was dead against it, I was to stay at home which foolishly I did to keep the peace. However, we learn from our mistakes and when we took on the childcare role I said I had interests , friends etc and I was not giving up my life again. I think that is why husband takes more of a role now, we did some have hellish rows but in the end I felt it wasn't worth destroying the family over. I feel appreciated for what I do. My grandchild is an absolute gift and hopefully I have been able to move on. The one thing I agree with is the tiredness, it is definitely a role for the young and fit. As for these women having IVF in their 50s and 60s to have children, I think they are off their heads.