Just because something can be done not mean it should be done. This is one such something.
"I just want honesty" - well, I'm going to be honest to the point of brutality, because I really think you need shaken out of this. I'm hoping that you being "at the VERY initial stages of thinking about this so not far down the road at all" means you're really just flying a kite here (rather than being set on it).
Bluntly - you're too old. You said "I made [the decision to have a child/IVF] 16 years ago it didn’t work but then I got into a relationship to put idea on hold for a while" - well if you could choose to put it on hold then, it can stay 'on hold' permanently.
You might "feel I could give a child a good life", and maybe you can - for as long as you live, but are you going to live long enough? Even if the IVF works, it's unlikely to work first time. You could be 55+ giving birth. 60 when the child goes to primary. 68 when they hit their teens. 76 when they're 21. And it will just be you two, since you "haven’t still got living family" - which means this child who you think you could give 'a good life' could well be completely without family before they've even left school. I don't call that a good life
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And that's before we get into the practicalities. You haven't had children before so you've no idea of how your body will respond to a pregnancy. Will you have the energy to get you through the pregnancy / early years / teenage years? Will you get gestational diabetes, will you be left with life-altering birth injuries; will your baby be born alive? How would you manage if the child were significantly disabled? How would a significantly disabled child manage when you die of old age and they still need support but they have zero family to support them?
How will the child feel about having one single living relative, a mother easily old enough to be their grandmother? At what age will they feel the precariousness of their family unit, and how will that affect how they approach the world? How will they feel about your age, will it embarrass them? Will it cause a genuine divide because your generations are too far apart - as in, will they 'get' you, and vice versa?
Every pregnancy is a gamble, and we all weigh up the odds before going in. But if your gamble doesn't come off, it will be your child paying the price, not you.
Don't do it.