OP.
You have to look after you here.
And your child.
There are valid reasons for not having a child with him. Which is why you've gone so far with giving yourself that option.
But actually this is going against your instinct. Your instinct is to protect and love your child.
You're very conflicted because you're trying to make the biggest decision if your life bug you don't have your own experience to go on. You haven't had a child before, and you haven't had an abortion.
Some people are very confident that abortion is their best choice. Many people aren't. Of those, some go ahead and later feel relieved. Others go ahead and feel the most awful regret for the rest of their lives.
You've come here for advice, and I'll give you mine.
Number 1 is: this is YOUR life, your body, and your baby. So ultimately you're going to be more likely to do the right thing going with your instincts. Because all the people telling you what they would do are not you, and will disappear once you've taken your decision, and you'll be left with you. You will have to answer to and support you.
Number 2: It seems you do want children. In this situation, abortion is harder and is based on the hope (because that's all it can be) that you'll get pregnant again. You ask if it's harder over 35. Statistically it is, and there are more chances of miscarriage and genetic defects the older you get. Having said that, millions of older woman conceive with no problem, and many of them have successful pregnancies. BUT. This is all statistical. Again, you are you. Nobody can tell you for certain you'll have another successful pregnancy. You very most likely will, but there is no guarantee.
What is certain and what you do know 100% is that you are pregnant right now.
I have extensive firsthand experience of an abusive partner. And I've had an abortion. So I'm in a good position to share my experience-based thoughts with you.
I had an abortion when I was 21. Because my partner was abusive. And I was told I was too young by friends and family.
It devastated me as was totally against my instincts. But the only thought over the years I've had is that at least I didn't have his influence in my life. And I didn't have to see him.
But I was very young and I've gone on to have two children. My first husband was, I can probably say, rebound from what happened. A nice guy, amazing child, but marriage ended mutually and amicably. My second partner has not been so easy. We have a beautiful daughter. But he has proved very very difficult. And I have felt the pain of him being her father, and both of us being exposed to his madness.
So I know the feeling of what it is to have someone forever in my life who I know I'd be better off without.
And I'd rather have my daughter and deal with him, than not have her.
There is a lot of support, I think, to help you go it alone.
There is nothing that can make you lose the regret after terminating a pregnancy.
I'm sure you've thought most or all of this, which is why it's so hard.
I do get it that it's easier maybe to terminate and start afresh. Just your age and stage would caution me, because nothing is certain.
You really need some very neutral counselling, and you won't get that from the BPAS.
Just listen to yourself. Ultimately you are the only one who's going to be living with this choice. And your baby, if you chose him or her.